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第二部分 閱讀理解(共20小題。每小題3分;滿分60分)
閱讀下列短文,從每篇短文后所給各題的四個(gè)選項(xiàng)(A、B、C和D)中,選出最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑。
Scientific experiments can sometimes go wrong and when they do the results may range from the disastrous to the troubling. One such experiment took place in South America about fifty years ago. Whether its final consequences will cause serious damage or nothing more than a small trouble still remains to be seen.
The story began in 1956 when an American scientist working in Brazil decided to solve the problem of increasing the productivity of that country's bees. He imported a very active type of African bee from Tanzania and mated it with the more easy-going native variety to produce a new kind of bees. The new bees worked harder and produced twice as much honey. It seemed that Professor Kerr, for that was the scientist's name, had a total success on his hands.
Then things began to go wrong. For some reason as yet unseen, but perhaps as a result of something in their environment, the new bees began to develop extremely attacking personalities. They became bad-tempered and easy to be angry, attacked the native bees and drove them from their living places.
But worse was to follow. Having taken over the countryside, the new bees, with their dangerous stings (叮), began to attack its neighbours — cats, dogs, horses, chickens and finally man himself. A long period of terror began that has so far killed a great number of animals and about 150 human beings.
This would have been bad enough if the bees had stayed in Brazil. But now they are on the move, heading northwards in countless millions towards Central and North America, and moving at the alarming speed of 200 miles a year. The countries that lie in their path are naturally worried because it looks as if nothing can be done to stop them.
56. The results of the South American experiment_______.
A. have caused a serious trouble           B. have proved to be wrong
C. are not yet certain                                 D. are not important
57. The experiment mentioned in this passage was designed to_______.
A. increase the amount of honey in Brazil
B. make Brazilian bees more easy-going
C. increase the number of bees in Brazil
D. make African bees less active
58. Which of the following may be the cause of the new bees' attacking personalities?
A. Their production of honey.                     B. Their hard work.
C. Their living environment.               D. Their bad temper.
59. The last paragraph implies that _______.
A. the bees have been driven to Central and North America
B. the bees may bring about trouble in more countries
C. the bees must be stopped from moving north
D. the bees prefer to live in Brazil

      
56-59  CACB

解析

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(共25小題。第一節(jié)每小題2分,第二節(jié)每小題1分;滿分45分)

第一節(jié)   閱讀下列短文,從每題所給的四個(gè)選項(xiàng)(A、B、C和D)中,選出最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑。

D

When people lose legs after accidents or illnesses, emergency care and artificial limbs(假肢)often allow them to walk again. Newts (蠑螈) in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re–grow limbs, but they haven’t quite figured out how these creatures do it.

  Researchers have now come up with some new ideas. Their work may give people the ability to re – grow lost limbs. The researchers started with two simple experiments:when you cut a newt’s leg at the ankle, only the foot grows back;when you cut off a leg at the very end, the whole leg grows back. In both cases, the re–growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.

How do a newt’s stem cells know when to grow only a foot and when to re–grow a whole leg?

This question relates to another mystery. In newts, a cut–off leg will grow back only if the nerve bundle(神經(jīng)束)in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re–grow a new leg.

In its study, a British team focused on a protein called nAG. When the team prevented nerves in a limb from growing, but added the nAG protein to stem cells in the limb, the limb still re–grew. That protein seems to guide limb re–growth. People have proteins that are similar to nAG. Further research into these materials may someday help human limbs recover by themselves.

In the experiments, the researchers cut off a newt’s foot or leg to find out _____.

 A. what stem cells were                  B. whether they would grow back

 C. how long it would take to re–grow    D. how they would re – grow

A newt will re–grow its leg if _____.

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 C. Stem cells and proteins.              D. Stem cells and nerve bundles.

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A
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