【C13】_考试资料网

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C1】

A．wasting
B．spending
C．making
D．killing

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C1】

A．subsequently
B．presently
C．lately
D．previously

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C2】

A．physical
B．academic
C．social
D．educational

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C3】

A．story
B．worry
C．expectation
D．opposite

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C2】

A．produced
B．stimulated
C．contributed
D．increased

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C4】

A．fit
B．good
C．positive
D．inactive

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C3】

A．truth
B．proof
C．act
D．growth

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C4】

A．produced
B．coined
C．composed
D．designed

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C5】

A．test
B．sports
C．wisdom
D．intelligence

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C6】

A．for
B．across
C．before
D．by

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C5】

A．unless
B．if
C．though
D．since

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C7】

A．challenging
B．necessary
C．simple
D．demanding

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C6】

A．thanks to
B．in spite of
C．but for
D．except for

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C8】

A．constitute
B．keep
C．feed
D．foster

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C7】

A．by
B．with
C．upon
D．over

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C9】

A．nerve
B．energy
C．food
D．power

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C8】

A．although
B．if
C．whereas
D．because

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C10】

A．cells
B．textures
C．parts
D．tissues

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C9】

A．dubious
B．additional
C．distinguishable
D．distinct

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C11】

A．without
B．including
C．with
D．except

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C10】

A．density
B．structure
C．analysis
D．collection

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C12】

A．splendid
B．rich
C．large
D．significant

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C13】

A．reduces
B．intensifies
C．enhances
D．aggravates

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C11】

A．adjusting
B．modifying
C．switching
D．changing

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C14】

A．moving out
B．moving around
C．moving up
D．moving on

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C12】

A．identifiably
B．incredibly
C．constantly
D．frankly

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C13】

A．stream
B．move
C．stir
D．float

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C15】

A．depend
B．count
C．base
D．focus

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C14】

A．controlled
B．created
C．converted
D．regulated

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C16】

A．institute
B．interpret
C．prove
D．describe

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C15】

A．combining
B．connecting
C．competing
D．interfering

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C17】

A．Whenever
B．So
C．How
D．However

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C16】

A．lowered
B．brightened
C．flickered
D．dimmed

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C18】

A．meanwhile
B．although
C．if
D．since

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C17】

A．functional
B．noticeable
C．transparent
D．conspicuous

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C19】

A．greatly
B．barely
C．nearly
D．hardly

单项选择题

Children need exercise. Parents often worry that 【C1】time for athletics or even for just playing on the Jungle Jim is going to take away from their kids" 【C2】achievement. But actually, the【C3】is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】are better in school, get better grades, and have higher【C5】scores than kids who lack of exercise. And that is probably because【C6】the lifespan, even into old age, there"s a strong correlation between a healthy heart and a healthy brain. The brain is the most【C7】organ that your circulatory system has to【C8】. It takes up a lot of the body"s oxygen and a lot of the body"s【C9】. And unlike most of your【C10】your brain can"t live very long【C11】that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】intellectual performance. The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】, and parents should really【C15】, I think, on making sure that that"s fun, first of all. You don"t want to【C16】exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】much your kids like climbing trees, they"re not going to be doing that when they"re 40, not most of us anyway. And【C18】you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】reduce the chance that they"re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】happens around the age of 13 or so.【C20】

A．improvement
B．growth
C．transition
D．transfer

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C18】

A．pierce
B．prick
C．penetrate
D．stab

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C19】

A．plots
B．scenarios
C．places
D．settings

单项选择题

Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than "superfast" broadband. The fastest speed【C1】reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】 The term Li-Fi was【C4】by Edinburgh University"s Prof Harald Haas【C5】the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】the electromagnetic spectrum, but【C8】Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】Li-Fi signals work by【C11】bulbs on and off【C12】quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council. Existing LED light bulbs could be【C14】to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】to the point that they were not visible to humans and yet still【C17】. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】solid materials. The makers of Li-Fi note that this quality might actually be an advantage in some【C19】making Li-Fi more【C20】than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.【C20】

A．secure
B．risky
C．definite
D．dangerous

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