[单项选择]According to the passage, why haven’t scientists found a cure for the common cold（）
A. They haven’t devoted as much energy to medicine as to space travel.
B. There are too many kinds of cold viruses for them to identify.
C. It is not economical to find a cure for each type of cold.
D. They believe people can recover without treatment.

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[单项选择]According to the passage, why is age classification changeable
A. An individual’s age classification changes as one progresses through the life cycle.
B. The individual may be an ageist with respect to others.
C. An individual’s age classification changes with the development of society.
D. The individual may be an ageist with respect to himsel

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[单项选择]According to the passage, why would the landowners respond to environmental concerns a. They wish to stimulate economic growth. b. They wish to improve their public image. c. They have a tradition of cooperating with the government. d. They are afraid of federal legislation.

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[单项选择]According to the passage, why do many fishes stay in group ？（）
A. It helps improve their safety.
B. It allows them to swim faster.
C. It helps them fight their predators.
D. It allows them to avoid twists and turns.

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[单项选择]According to the passage, why do many fish stay in groups（）
A. It helps improve their safety.
B. It helps them fight their predators.
C. It allows them to swim faster.
D. It allows them to avoid twists and turns.

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[填空题]S6. According to the passage, why are students of the same achievement level grouped together

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[简答题]S3. According to the passage, why icebergs are dangerous

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[单项选择]According to the passage, scientists have decided that sulfur aerosols from volcanic eruptions affect global temperatures to a greater extent than ash clouds because
A. the greenhouse gas effect produced by human activities tends to have a much greater environmental effect than that of volcanic explosions
B. clouds of sulfur-rich gases tend to achieve greater heights in the stratosphere than do ash clouds
C. a particular explosion producing high sulfur and little ash had a greater environmental effect than the converse
D. the burning of fossil fuels tends to exacerbate the effects of sulfurous aerosols, but not those of ash clouds
E. global warming effects tend to minimize the impact of ash clouds, but not those of sulfurous aerosols

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[单项选择]Passage Four

Why has the kiwi survived while its relatives the moas have become extinct One reason, I think, is that it has adopted nocturnal(夜间活动的) habits. Kiwis are not normally about in the daytime. During the daylight hours they lie up in hiding, where enemies have no hope of finding them. Their coloration protects them; the strange drab(黄褐色的) feathering, so unlike that of most birds, gives them a cloak(伪装)of invisibility while they sleep. And when night falls, out they come to scratch in the ground and find worms and feed to their hearts’ content.
They couldn’t do that so effectively if they didn’t have another peculiarity that I have not mentioned yet. The nostrils(鼻孔) of most birds open high up near the base of the beak(猛禽的嘴), but the kiwi wears his nostrils right near the tip of the long bill. That’s good for a bird that feeds in th
A. it stays out of sight and sleeps during the day
B. it usually goes from place to place during the day
C. it changes the colour of its feather in the daytime
D. it is caught and eaten by its enemy in the daytime

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[判断题]

Scientists do not understand why women should outlive men by five years.

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[单项选择]

Passage Three

Why does the electric car seem to be the best alternative so far
A. It is comfortable.
B. It is best made.
C. It causes no pollution.
D. It makes less noise.

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[单项选择]

Passage Two

Why do some people feel guilty when they drink coffee
A. They are not allowed to drink coffee.
B. They think coffee does no good to them.
C. They think coffee is too expensive.
D. They should not drink coffee when working.

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[单项选择]Passage Four

Why is there no risk to the customer when a hank prints the customer’s name to his cheques
When anyone opens a current account at a bank, he is lending the bank money, repayment of which he may demand at any time, either in cash or by drawing a check in favor of another person. Primarily, the bank-customer relationship is that of debtor and creditor who is which depending on whether the customer’s account is in credit or overdrawn. But, in addition to that basically simple concept, the bank and its customer owe a large number of obligations to one another. Many of these obligations can give rise to problems and complications but a bank customer, unlike, say, a buyer of goods, cannot complain that the law is loaded against him.
The bank must obey its customer’s instructions, and not those of anyone else. When, for exa
A. must always be in credit
B. can’t draw any money if you’re overdrawn
C. can draw money without notice
D. can’t pay money to anyone else

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