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第二部分   閱讀理解

(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 _____.

 A. its ankle was cut off but the nerve bundle was good

 B. its leg was cut off and the nerve bundle stopped growing

C. its leg was cut off and the nerve bundle could grow back

D. its ankle and the nerve bundle were cut off

What do the underlined words “these materials” refer to?

A. Nerve bundles and proteins.            B. Proteins similar to nAG.

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

The first sentence of the passage _____.

 A. acts as a lead–in                  

B. shows where researchers got their new ideas

C. states the author’s opinion          

D. describes the result of researchers’ studies

【小題1】D

【小題2】C

【小題3】B

【小題4】A


解析:

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科目:高中英語 來源:2010年高考預(yù)測試題英語(一) 題型:閱讀理解


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The “Liaoludu 7” was traveling in the Bohai Straits from Lvshun in Liaoning Province to the port city of Longkou in Shandong Province.It suddenly lost its power at 2:30 pm and tilted(傾斜)on its side.With 81 people on board, the ferry(渡船)began to sink.

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After more than four hours of fighting strong winds and freezing ocean water, the passengers were rescued.All but four survived.These four died after spending too long time in the freezing waters, according to a spokesperson for the Beijing-based center.

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  B. reduce gradually the number of cigarettes you have every day

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  D. take drugs to prevent you from feeling like smoking

 

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