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第二部分  閱讀理解(共兩節,滿分40分)

(共15小題,每小題2分,滿分30分)

閱讀下列四篇短文,從每小題后所給的A、B、C、D四個選項中,選出最佳選項,并在答題卡上將該選項涂黑。

  Ask Dr ? Jeffers

This month Dr. Jeffers is answering questions about the human brain and how it works.

Dear Dr. Jeffers,

One of my colleagues, Felix Moeller, told me that scientists are learning to use computer to ‘read minds’. Is there any truth to this story/

—Jane Leon, New York, USA

Dear Ms. Leon,

Well, a lot of research is being conducted in this area, but so far, the brain scanning equipment and corresponding computer programs haven’t been able to actually read thoughts. In one experiment, test subjects(受試者)were connected to scanning equipment and shown two numbers on a screen. They were then asked to choose between adding or subtracting(減)the two numbers. Using this method, researchers were able to follow brain processes and make the correct assumptions(假設)70 percent of the time. It’s not quite mind reading, but it’s certainly a first step.

—Dr. J.

Dear Dr. Jeffers,

My three-year-old son loves it when I dig my fingers into his sides and tickle (胳肢)him until he laughs uncontrollably. The other day I noticed him trying to tickle himself but he couldn’t do it. Why not?

—Glenn Lewis, Vancouver, Canada

Dear Mr. Lewis,

It’s because of how the brain works. The brain is trained to know what to pay attention to and what to ignore. It causes us to ignore physical feelings we expect to happen, but it causes a mild panic reaction when there is an unexpected feeling. For example, you don’t notice how your shoulder feels while you’re walking down the street. But if someone comes up behind you and touches you lightly on the shoulder, you may jump in fear. It’s that unexpected part that causes the tickle reaction.

—Dr. J.

1.What can we learn from the answer to the first question?                          

A. Some equipment is able to read human minds.

B. Some progress has been made in mind reading.

C. Test subjects have been used tomake decisions.

D. Computer programs can copy brain processes.

2.People laugh when tickled by others bedause the feeling is _______.                 

A. unexpected        B.expected        C. comfortable        D. uncomfortable

3.Who has got a little child according to the text?                                  

A. Ms. Leon          B. Mr. Lewis        C. Mr. Moeller        D. Dr. Jeffers

4.According to the text, Jeffers is probably _______.                                

A. a computer programmer                B. a test subject

C. a human brain expert                   D. a medical doctor

 

【答案】

 

 B

 A

 B

 C

【解析】

 

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(共25小題。第一節每小題2分,第二節每小題1分;滿分45分)

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

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 _____.

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