单项选择题

In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat. But this is not true. Cold simple means " having very little heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible. Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun’ s heat that is trapped in things such as wood, coal and oil. And he has been able to use this heat. Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energy into mechanical energy. Engines can do the work of many men. Without engines industrial civilization is impossible. Yet when the first engines were built in the 17th century, men were, still wondering about the nature of heat. "What is it" they asked. Not until the early years of the 19th century did they find the right answer.From the last two sentences, we can see______.

A.men have never found the nature of heat
B.men found the nature of heat in the 17 th century
C.men found the nature of heat in the 19 th century
D.men found the nature of heat before the 19th century
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单项选择题

Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships(战船), with which to gain itself an empire. It set up the empire but,- without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.What is the most important service of trees to man according to the passage

A.They help him make money.
B.They give him wood and other products.
C.They help him prevent droughts and floods.
D.They give him shade.
单项选择题

Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships(战船), with which to gain itself an empire. It set up the empire but,- without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.Why do forests in many parts of the world slowly disappear

A.New trees are not looked after properly.
B.Many trees have been cut down by man
C.Man has not paid enough attention to planting trees.
D.All of the above.
单项选择题

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value. A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’ t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really " promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially tilling stations will not accept cash at night for security reasons." Barter"(Paragraph 1)here means ______.

A.exchanging goods for money
B.exchanging goods for goods
C.exchanging a sheep for anything in the market
D.exchanging money for goods
单项选择题

Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships(战船), with which to gain itself an empire. It set up the empire but,- without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.Why did the country mentioned in the passage suffer from floods and starvation

A.Because an empire was set up.
B.Because the empire fell to pieces.
C.Because it lost its trees.
D.Because too much had been spent on wars.
单项选择题

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value. A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’ t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really " promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially tilling stations will not accept cash at night for security reasons.Why were precious metals gradually used for making coins

A.Because they were durable and portable.
B.Because they were recognizable.
C.Because they were divisible.
D.All of the above
单项选择题

Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships(战船), with which to gain itself an empire. It set up the empire but,- without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.Why does land become desert after all trees are cut down

A.Because nothing remains on land except floods.
B.Because there are no longer trees to keep the rain and protect the top-soil.
C.Because too much rain sinks in and washes away the top-soil.
D.Because roots of the trees break up the soil.
单项选择题

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value. A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’ t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really " promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially tilling stations will not accept cash at night for security reasons.Coins were given value according to the exact amount of metal contained in them______.

A.before the eighteenth and nineteenth centuries
B.after the eighteenth and nineteenth centuries
C.during the eighteenth and nineteenth centuries
D.between the eighteenth and nineteenth centuries
单项选择题

Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships(战船), with which to gain itself an empire. It set up the empire but,- without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.What does the author tell us in this passage

A.How trees help prevent droughts and floods.
B.The relationship between trees and man.
C.How an empire fell to pieces in ancient times.
D.A story of trees.
单项选择题

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value. A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’ t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really " promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially tilling stations will not accept cash at night for security reasons."Promises to pay"(Paragraph 2)means______.

A.possibilities to pay
B.necessities to pay
C.obligations to pay
D.opportunities to pay
单项选择题

It’ s no great surprise that Bill Gates has decided to walk away from his day-to-day involvement with Microsoft, and use his full attention to oversee how the Bill Gates Foundation spends its $ 16 billion on philanthropy, or charity. But Gates is not the first one to follow the path. Ever since the industrial revolution, wealthy self-made businessmen and businesswomen have felt a calling to create a legacy that goes beyond a profit and loss sheet. The saying " He who dies rich, dies disgraced" runs deeply through the business community. But out of all the great philanthropists, Mr. Gates’ career path appears to be closest to the oil millionaire John Rockefeller. Both were self-made men and both became the richest men on the planet. Rockefeller was in his late fifties when he turned his attention full time to philanthropy— creating vast charitable foundations to promote health and education. Now Gates says he will do the same in his early fifties. " With great wealth comes great responsibility," he adds. Like Gates, many philanthropists do not want to pass on too much wealth to their children. They want them to be comfortable, with a nice house and some money in trust for their grandchildren. But they don’ t want to leave them millions and millions because they know how important it is for them to make their own way. In Britain, for instance, the newspaper’ s rich lists are increasingly dominated by self-made millionaires, rather than inherited wealth. New money is less likely to be tied up in assets, making it ripe for philanthropy. The appearance of the welfare state also had a great impact on attitudes to philanthropy. The state was saying it would take over much of the role of what was once regarded as the responsibility of private philanthropists.Bill Gates has done all’ the following EXCEPT______.

A.abandoning his career with Microsoft’s daily business
B.devoting the rest of his life to philanthropic causes
C.leaving his children enough money for a comfortable life
D.defying John Rockefeller in creating charitable foundations
单项选择题

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value. A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’ t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really " promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially tilling stations will not accept cash at night for security reasons.A world without any money in the form of coins and paper is______.

A.suitable
B.possible
C.necessary
D.avoidable
单项选择题

It’ s no great surprise that Bill Gates has decided to walk away from his day-to-day involvement with Microsoft, and use his full attention to oversee how the Bill Gates Foundation spends its $ 16 billion on philanthropy, or charity. But Gates is not the first one to follow the path. Ever since the industrial revolution, wealthy self-made businessmen and businesswomen have felt a calling to create a legacy that goes beyond a profit and loss sheet. The saying " He who dies rich, dies disgraced" runs deeply through the business community. But out of all the great philanthropists, Mr. Gates’ career path appears to be closest to the oil millionaire John Rockefeller. Both were self-made men and both became the richest men on the planet. Rockefeller was in his late fifties when he turned his attention full time to philanthropy— creating vast charitable foundations to promote health and education. Now Gates says he will do the same in his early fifties. " With great wealth comes great responsibility," he adds. Like Gates, many philanthropists do not want to pass on too much wealth to their children. They want them to be comfortable, with a nice house and some money in trust for their grandchildren. But they don’ t want to leave them millions and millions because they know how important it is for them to make their own way. In Britain, for instance, the newspaper’ s rich lists are increasingly dominated by self-made millionaires, rather than inherited wealth. New money is less likely to be tied up in assets, making it ripe for philanthropy. The appearance of the welfare state also had a great impact on attitudes to philanthropy. The state was saying it would take over much of the role of what was once regarded as the responsibility of private philanthropists.The saying "He who dies rich, dies disgraced"(Para. 1)probably means that______.

A.the wealthy people should give away their fortunes after death
B.the wealthy people should feel ashamed for their assets
C.the wealthy people should abandon their careers for charities
D.it is shameful for the wealthy people to keep their wealth till death
单项选择题

It’ s no great surprise that Bill Gates has decided to walk away from his day-to-day involvement with Microsoft, and use his full attention to oversee how the Bill Gates Foundation spends its $ 16 billion on philanthropy, or charity. But Gates is not the first one to follow the path. Ever since the industrial revolution, wealthy self-made businessmen and businesswomen have felt a calling to create a legacy that goes beyond a profit and loss sheet. The saying " He who dies rich, dies disgraced" runs deeply through the business community. But out of all the great philanthropists, Mr. Gates’ career path appears to be closest to the oil millionaire John Rockefeller. Both were self-made men and both became the richest men on the planet. Rockefeller was in his late fifties when he turned his attention full time to philanthropy— creating vast charitable foundations to promote health and education. Now Gates says he will do the same in his early fifties. " With great wealth comes great responsibility," he adds. Like Gates, many philanthropists do not want to pass on too much wealth to their children. They want them to be comfortable, with a nice house and some money in trust for their grandchildren. But they don’ t want to leave them millions and millions because they know how important it is for them to make their own way. In Britain, for instance, the newspaper’ s rich lists are increasingly dominated by self-made millionaires, rather than inherited wealth. New money is less likely to be tied up in assets, making it ripe for philanthropy. The appearance of the welfare state also had a great impact on attitudes to philanthropy. The state was saying it would take over much of the role of what was once regarded as the responsibility of private philanthropists.Gates and Rockefeller are similar in that______.

A.both of them inherited their wealth
B.their career paths are exactly the same
C.both decided to devote to charity in their fifties
D.both made their fortunes in the same way
单项选择题

It’ s no great surprise that Bill Gates has decided to walk away from his day-to-day involvement with Microsoft, and use his full attention to oversee how the Bill Gates Foundation spends its $ 16 billion on philanthropy, or charity. But Gates is not the first one to follow the path. Ever since the industrial revolution, wealthy self-made businessmen and businesswomen have felt a calling to create a legacy that goes beyond a profit and loss sheet. The saying " He who dies rich, dies disgraced" runs deeply through the business community. But out of all the great philanthropists, Mr. Gates’ career path appears to be closest to the oil millionaire John Rockefeller. Both were self-made men and both became the richest men on the planet. Rockefeller was in his late fifties when he turned his attention full time to philanthropy— creating vast charitable foundations to promote health and education. Now Gates says he will do the same in his early fifties. " With great wealth comes great responsibility," he adds. Like Gates, many philanthropists do not want to pass on too much wealth to their children. They want them to be comfortable, with a nice house and some money in trust for their grandchildren. But they don’ t want to leave them millions and millions because they know how important it is for them to make their own way. In Britain, for instance, the newspaper’ s rich lists are increasingly dominated by self-made millionaires, rather than inherited wealth. New money is less likely to be tied up in assets, making it ripe for philanthropy. The appearance of the welfare state also had a great impact on attitudes to philanthropy. The state was saying it would take over much of the role of what was once regarded as the responsibility of private philanthropists.Many wealthy people don’t want to leave too much behind mainly because______.

A.it is not easy for them to make their fortunes
B.they want their children to make their own way
C.they just wish their children to have a comfortable life
D.they hope to gain reputation by donating their wealth
单项选择题

It’ s no great surprise that Bill Gates has decided to walk away from his day-to-day involvement with Microsoft, and use his full attention to oversee how the Bill Gates Foundation spends its $ 16 billion on philanthropy, or charity. But Gates is not the first one to follow the path. Ever since the industrial revolution, wealthy self-made businessmen and businesswomen have felt a calling to create a legacy that goes beyond a profit and loss sheet. The saying " He who dies rich, dies disgraced" runs deeply through the business community. But out of all the great philanthropists, Mr. Gates’ career path appears to be closest to the oil millionaire John Rockefeller. Both were self-made men and both became the richest men on the planet. Rockefeller was in his late fifties when he turned his attention full time to philanthropy— creating vast charitable foundations to promote health and education. Now Gates says he will do the same in his early fifties. " With great wealth comes great responsibility," he adds. Like Gates, many philanthropists do not want to pass on too much wealth to their children. They want them to be comfortable, with a nice house and some money in trust for their grandchildren. But they don’ t want to leave them millions and millions because they know how important it is for them to make their own way. In Britain, for instance, the newspaper’ s rich lists are increasingly dominated by self-made millionaires, rather than inherited wealth. New money is less likely to be tied up in assets, making it ripe for philanthropy. The appearance of the welfare state also had a great impact on attitudes to philanthropy. The state was saying it would take over much of the role of what was once regarded as the responsibility of private philanthropists.The chief reason why philanthropy has come into a good stage is that______.

A.the new money is less likely to be regarded as one’ s private wealth
B.Gates will devote his full attention to philanthropy
C.the welfare state would take over all the charity responsibilities
D.many new millionaires are self-made rather than inherited
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