题目内容


C
It happened one morning 20 years ago. A British scientist Alec Jeffrey came across DNA fingerprinting: He identified the patterns of genetic material that are unique to almost every individual. His discovery changed everything from the way we do criminal investigations to the way we decide family law. But the professor of genetics at the University of Leicester, UK, is still surprised, and a bit worried, by the power of the technology he released upon the world.
The patterns within DNA are unique to each individual, except identical twins, who share the same pattern. The ability to identify these patterns has been used to convict(证明…有罪) murderers and to clear people who are wrongly accused. It is also used to identify the victims of war and settle disputes over who is the father of a child.
Jeffrey said he and his colleagues made the discovery by accident while tracking genetic
variations(变异). But, within six months of the discovery, genetic fingerprinting had been used in an immigration case, to prove that an African boy really was his parents’ son.·In 1986, it was used for the first time in a British criminal case: It cleared one suspect after being accused of two murders and helped convict another man.
DNA testing is now very common. In Britain, a national criminal database established in 1995 now contains 2.5 million DNA samples. The U.S. and Canada are developing similar systems. But there are fears about the stored DNA samples and how they could be used to harm a person’s privacy. That includes a person’s medical history, racial origin or psychological profile. “There is the long-term risk that people can get into these samples and start getting additional information about a person’s paternity(父子关系) or risk of disease,” Jeffrey said.
DNA testing is not an unfailing proof of identity. Still, it is considered a reasonably reliable system for determining the things it is used for. Jeffrey estimates the probability of two individuals’ DNA profiles matching in the most commonly used tests at one in a billion.
62. According to the text, DNA testing can NOT be used in _______ .
A. doing criminal investigations        B. deciding faraily law
C. clearmg wrongly accused people     D. telling twins apart
63. DNA samples are not popular with all the people because _______ .
A. the government in Britain establishes a criminal database
B. the US and Canada develop similar systems
C. DNA samples can be used to harm a person’s privacy
D. DNA testing is too expensive and dangerous now
64. Where will you most probably find this article?
A. In a guidebook.                   B. In a storybook.
C. In a science fiction.               D. In a scientific magazine.
65. Which is the best title for the passage?
A. Discovery of DNA testing by Jeffery  B. Practice of DNA testing in court
C. DNA testing in the present situation   D.Benefits and side effects of DNA testing


62—65 DCDD 

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Television is an important part of modern life, one we can hardly imagine living without it. If I were forced to live without television, I would seek other interests, socialize(参加社交活动) with my friends and family and exercise more often.

Without TV in my home, I would have time to seek other interests. For example, I love to play the piano and without the fun of TV, I would have more time to practice. At other times, I could paint portraits of my family and friends.  

Not only that, but also I could find much more time to socialize with my friends and family if my TV disappeared. At my house, the TV is always on during dinner. Without TV we might have time to tell each other about what happened to us that day. In addition, we could more easily find more time to talk with old friends on the telephone. Thus, social time would increase without TV.

Most importantly, lacking a TV would give me a big increase in the available time for exercise in my life. With extra time, I could make the long journey to Bowen Island and go on an enjoyable hike in the mountains. Another exercise would be to go swimming or to an aerobics(有氧运动) class at Bonsor Community Centre. Watching more TV will only develop my bottom muscle.

Seeking other interests, socializing with friends and family, and exercising frequently would be the benefits of having no TV at my home. Just think how much more time I would have if I got rid of my computer, too!

62. According to the passage, we can infer that the author _________ too much.

A. takes exercise                                  B. plays the piano

C. watches TV                                    D. talks with his family

63. The passage mainly tells us ________.

A. we can’t live without TV

B. TV does harm to the author’s life

C. what the author could do without TV

D. why the author dislikes TV

64. The author thinks that he could do the following EXCEPT _____ without TV.

A. playing computers                       

B. doing outdoor sports

C. make conversations with family and friends  

D. doing social activities

65. What’s the most suitable title for the passage?

A. We can’t live without TV.                      B. TV benefits us a lot.

C. Disadvantages of TV.                     D. Living without TV.

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