Question

On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could read the whole “map” of the human body: DNA. DNA is something that everybody has, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.

People have been trying to understand the human body for a long time. In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family. It is because of small things named “genes” in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are real messages written in the DNA with a special language.

In 1961, Marshall Nirenberg and Johann Matthaci found a message in DNA showing how DNA tells the cell（细胞）to build its parts. Scientists have now found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word”   means, we can help save more people from several illnesses.

Most people hope that this will help make better medicine and help sick people. Other people worry that when people begin to know more words and find out lots of other information, we might use it in a wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have to meet a lot of trouble if DNA technic wasn’t limited（限制）in use.

1.When did we first know why we look like other people m our family?

A．In 1860           B．In 1953           C．In 1961           D．In 2000

2.What does the underlined word “ genes” mean?

A. The “map” of DNA.                B. A special language.

C. Small parts of DNA.                D. DNA

3.What did the two scientists first discover in 1961 ?

A. The “map” of DNA.               B. A new illness.

C. The language of DNA.              D. A message of DNA.

4.What can we do if we understand some “ words” of the language inside the body

A．Make people get new jobs.

B．Make medicine for illnesses.

C．Make maps of human.

D．Make people less attractive.

5.What do people think about this work’?

A．It can cause good or bad results.

B．It can cause only good results.

C．It can cause good results but won’t work.

D．It can cause only bad results.

 

Answer 1

【答案】

1.A

2.C

3.D

4.B

5.A

【解析】

试题分析：这篇短文简要的介绍了额DNA的发现历史，并介绍了这一发现对于人类生活的影响及人们对此一发现的不同看法。

1.根据第二段In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family.描述，可知选A

2.根据第二段and found out that those small parts are real messages written in the DNA 描述，可知选C。

3.根据第三段In 1961, Marshall Nirenberg and Johann Matthaci found a message in DNA showing how DNA tells the cell（细胞）to build its parts.描述，可知选D。

4.根据第三段By understanding what just one “word”   means, we can help save more people from several illnesses.及第四段Most people hope that this will help make better medicine and help sick people.描述，可知选B。

5.根据短文最后一段描述，可知可能引起好的或者坏的结果。故选A。

考点：关于DNA发现历史的记述文阅读

点评：本文浅显易懂，各个小题都能在文中找到适当依据。只要认真阅读短文，注意前后联系，就能顺利完成阅读。文章所设试题主要考察细节查找，做题关键是找出原文的根据，认真核查小题和原文的异同。