On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now 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 Matthaei 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 technology (技术) wasn’t limited (限制) in use.
小题1:When did we first know why we look like other people in our family?
A．In 1860.
B．In 1953.
C．In 1961.
D．In 2000.小题2: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.
小题3: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.小题4: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.
小题1:D
小题2:D
小题3:B
小题4:A
题目分析：短文大意：本文简单介绍了科学家对DNA的研究历程。大多数人希望这将有助于制造更好的药物救治生病的人。其也有人担心这可能会带来一些不好的结果。
小题1: 细节理解题，根据第一段首句On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole “map” of the human body: DNA 和最后一句DNA is the reason that we look like our mother and father,可知我们第一次知道我们为什么看起来像家庭里的其他人是在2000年，所以选D。
小题2:细节理解题。根据第三段首句In 1961, Marshall Nirenberg and Johann Matthaei found a message in DNA showing how DNA tells the cell to build its parts可知这两位科学家子啊1961年首次发现了DNA的信息，所以选 D。
小题3:细节理解题。根据Most people hope that this will help make better medicine and help sick people.可知选B。
小题4: 细节理解题。根据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.可知人们认为这项工作可能导致好结果，也可能导致坏结果，所以选A。