单项选择题X 纠错 Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
A．They are perfect.
B．They need to be improved.
C．They are nuisances.
D．They are dispensabl
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单项选择题 Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
A．They carried passengers, but not cargo.
B．They were large, but surprisingly fast.
C．They were the first successful steam-powered ships.
D．They were more reliable than other ships of the 1860’s.
单项选择题Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow (31) around 37℃; a (32) , of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider (33) , the integrated actions of bodily systems are impaired. Other animals have a wider tolerance (34) changes of bodily temperature.
For centuries (35) has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of (36) the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division (37) " warm blooded" and "cold blood- ed " species; warm blooded included mammals and birds, (38) all other creatures were considered cold blooded. (39) more species were studied, it became evident that this classification was (40) A fence lizard usually has a body temperature only a degree or two below (41) of humans and so is not cold. (42) the next distinction was made between animals that maintain a (43) body temperature and those whose body temperature varies with their environment. But this classification also proved inadequate, (44) among mammals there are many that vary their body temperatures during hibernation. (45) many invertebrates that live in the (46) of the ocean never experience a change in the chill of the deep water, and their body temperatures remain constant. The current distinction is between animals whose body temperature is (47) chiefly by internal metabolic processes and those whose temperature is regulated by the (48) . The latter do so mainly by moving to favorable sites or by changing their exposure to (49) sources of heat. Mammals and birds also regulate their temperature by choosing favorable environments, but primarily they regulate their temperature by making a variety of internal (50) .
A．scope
B．range
C．scale
D．field
单项选择题 Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
A．their personal life.
B．employment opportunities.
C．economic development.
D．their views on happiness.
单项选择题 Questions 29 and 30 are based on the following news. At the end of the news item, you will be given I0 seconds to answer the questions.
Now, listen to the news.
A．meat canning, a tradition in American church groups.
B．American church groups’ canning food for those in need.
C．how to can food in American church groups.
D．die canned food delivery all over the worl
单项选择题 Questions 27 and 28 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.
A．The inhibitor of the HIV transmission.
B．An effective way to deliver AIDS drugs.
C．A good strategy to prevent HIV transmission.
D．Bacteria from yogurt may help fight HIV.
单项选择题 Questions 24 and 25 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.
A．More than 14,000.
B．More than 7,000.
C．More than 18,000.
D．More than 21,000.
单项选择题 Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.
单项选择题 Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
A．take a make-up exam later on.
B．make every effort to come to class.
C．spend two extra hours in class later on.
D．do extra work at hom
单项选择题 Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
A．Some listeners phone the hotlines for fun.
B．Some people just want to be heard by others.
C．Some people who don’t care what the topic is must have realized that they appear to be silly.
D．Listeners are encouraged to take part in the hotline programmes by the radio station.
单项选择题 Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
A．Help the man plan a student rally.
B．Use the student parking lot.
C．Make a donation to support the group.
D．Sign a petition.
