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[主观题]

It happened one morning 20 years ago. British scientist Alec Jeffrey stumbled upon DNA fin

gerprinting: He identified the patterns of genetic(基因的) 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 worded, 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 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. 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 rapes and 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(样本). 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 or risk of disease," Jeffrey said.

DNA testing is not an unfailing proof of identity. Till, it is considered a reasonably reliable system for determining the things it is used for. Jeffrey's estimates(估计) the probability of two individuals' DNA profiles matching in the most commonly used tests at between one in a billion or one in a trillion.

The passage is mainly about ______.

A．the discovery of fingerprinting by Jeffery

B．the practice of fingerprinting in court

C．the fingerprinting in the present situation

D．the merits and demerits of fingerprinting

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发布时间：2023-03-08
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更多“It happened one morning 20 years ago. British scientist Alec Jeffrey stumbled upon DNA fin”相关的问题

第1题

It （） that I met one of my old classmates on my way home yesterday.

A.took place

B.occurred

C.broke out

D.happened

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第2题

By saying "Let's hope that this time it really will be the last one", the father meant
that ______.

A. he wished people had not built the bonfire

B. he hoped people would not build any more bonfires

C. he hoped there would be no more wars in the world

D. he wished the Second World War had not happened

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第3题

Which of the following underlined parts is different in pronunciation from others？A.Mickey

Which of the following underlined parts is different in pronunciation from others？

A.Mickey Mouse is one of the most famous cartoon characters.

B.Diogenes comes from Kennia, which is in Africa

C.Disneyland was created by Walt Disney.

D.Paul is writing an unusual thing that happened to him.

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第4题

Two farmers were on their way home one evening after a hard day’s work. Both were tired. They happened to look up at the sky and saw a black cloud overhead.

“Ah!” said one farmer, "tomorrow we shall have rain and the rice will grow well.” The second answered, “nonsense (胡说),the rain will only damage the crops (庄稼). ”

So they began to quarrel (争吵). Just then a third farmer came along and asked them why they were quarreling. Both farmers explained about the black cloud.

“What cloud?” asked the third farmer. They all looked at the sky. The cloud was no longer there.

The two farmers fought (争吵) in words because ().

A.they were hungry

B.it rained

C.one said the rain would do good to the crops and the other didn't think so

D.they both hoped for rain

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第5题

Two farmers were on their way home one evening after a hard day’s work. Both were tired. They happened to look up at the sky and saw a black cloud overhead.

“Ah!” said one farmer, "tomorrow we shall have rain and the rice will grow well.” The second answered, “nonsense (胡说),the rain will only damage the crops (庄稼). ”

So they began to quarrel (争吵). Just then a third farmer came along and asked them why they were quarreling. Both farmers explained about the black cloud.

“What cloud?” asked the third farmer. They all looked at the sky. The cloud was no longer there.

(1)The two farmers were ().

A、going home

B、going to the field

C、going to work

D、going to see their friend

(2)When there are black block clouds in the sky, ().

A、it will rain soon

B、it will be fine

C、it will get hot

D、the sun is shining brightly

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第6题

Section ADirections: In this section, you will hear 8 short conversations and 2 long conve

Section A

Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

听力原文：M: What would you do if you heard a strange noise in the middle of the night？

W: I'd lie awake a little while, waiting to see if it happened again. And if it did, I would get up and see for myself to decide whether to call 911.

Q: How would you describe the woman？

(12)

A．Curious.

B．Lazy.

C．Cautious.

D．Cowardly.

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第7题

One day Bob took two of his frends into the mountains. They put up their tents and the

n rode off to a forest to see how the trees were growing.

In the aftemoon when they were about ten kilometers from their camp, It started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp？

Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house？ That would be a trip of thirty-five kilometers in such cold weather! It was getting late. They rode on and on. At last the horses stopped. Where were they？ None of them could tell. John looked around. What was that under the tree？ It was one of their tents!

1.John and his two friends went to the forest to watch the trees in the forest.()

2.They could not f1nd their way back because there was only one road to their camp.()

3.It is clear that they wanted the horses to take them to the camp.()

4.The horses stopped because they were tired after running for along way.()

5.The story happened at night when nothing could be seen.()

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第8题

Let me tell you a story about Berb and Mild Carbridge, who used to be very【21】For example,
Mild would forget to【22】dinner, or Berb would【23】up for work on Sunday【24】it was Monday. One summer they【25】to take a long plane trip. What do you guess happened？ Well, they got to the airport with only ten minutes to【26】. So time was short. In that【27】anyone would【28】the plane right away. But not Mr. and Mrs. Carbridge. They just had to buy some flight insurance(保险)【29】. All in all, who knows what will happen on a plane flight？ They quickly put some【30】into a machine and【31】came their insurance policy. "Who【32】get the money if we【33】, I wonder？" asked Mild. "My mother, of course," her husband【34】. "We'll mail the【35】to her. Now quick give me a stamp,【36】you？" he said. "The plane's going to【37】in another minute." Berb put the stamp on the envelope,【38】it in the mailbox, and【39】began to cry. What happened, do you guess？ He had mailed their【40】to his mother!

(36)

A．careless

B．forgetful

C．thoughtful

D．foolish

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第9题

Mrs. Andrews had a young cat and it was the cats frst winter One evening the cat was outide when it began to snow heavilyMsAndrews loked everywhere and shouted its name, but she did not find i so she telephoned the police and said, "Thave lost a smallblack cat. Has anybody found one?"

"No, Madam," said the policeman at the other end, "But the cats are really very strong animals. They sometimes live for days in the snow, and when somebody finds them, they are quite all right."

Mrs.Andrews felt happier when she heard this, "And," she said, "our cat is very clever. She almost talks."

The policeman was getting tired. "Well then," he said, "why don't you put your telephone down? Perhapssheis trying to telephone you now."

21、MisAndter hdacata wa es hanyerod

A. True

0 B. False

22、The cat was at home when it began to snow heavly

A. True

B. False

23、The story happened on a spring morning.

O A. Trwy

B. False

24、The underlined word "she" in the last sentence refers to thecat.

A. False

B. True

25、The policeman was getting rather tired becauseMrs Andrews had talked too much to him on the phone.

A. False

B. True

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第10题

根据下列短文，回答下列各题。 The unique human habit of taking in and employing animals--ev
en competitors like wolves--spurred on human tool-making and language, which have both driven humanitys success, Pat Shipman says, paleoanthropologist of Penn State University. "Wherever you go in the world, whatever ecosystem (生态系统), whatever culture, people live with animals," Shipman said. For early humans, taking in and caring for animals would seem like a poor strategy for survival. "On the face of it, you are wasting your resources. So this is a very weird behavior," Shipman said. But its not so weird in the context something else humans were doing about 2.6 million years ago: switching from a mostly vegetarian diet to one rich in meat. This happened because humans invented stone hunting tools that enabled them to compete with other top predators. Quite a rapid and bizarre switch for any animal. So we invented the equipment, learned how to track and kill, and eventually took in animals who also knew how to hunt--like wolves and other canines. Others, like goats, cows and horses, provided milk, hair and, finally, hides and meat. Managing all of these animals--or just tracking them--requires technology, knowledge and ways to preserve and convey information. So languages had to develop and evolve to meet the challenges. Tracking game has even been argued to be the origin of scientific inquiry, said Peter Richerson, professor emeritus (名誉退休的) in the Department of Environmental Science and Policy at the University of California, Davis. One of the signs that this happened is in petroglyphs (史前岩画) and other rock art left by ancient peoples. At first they were abstract, geometric patterns that are impossible to decipher (破译). Then they converge on one subject: animals. There have also been genetic changes in both humans and our animals. For the animals those changes developed because human bred them for specific traits, like a cow that gives more mill or a hen that lays more eggs. But this evolutionary influence works both ways. Dogs, for instance, might have been selectively taken in by humans who shared genes for more compassion, Those humans then prospered with the dogs help in hunting and securing their homes. What do we learn from the first paragraph about animals？

A.Animals have driven humanitys success.

B.Tool-making and language are uniquely human habits.

C.Employing wolves is uniquely human habit.

D.People live with animals everywhere.

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第11题

Acting is such an over-crowded profession that the only advice that should be given to a y
oung person thinking of going on the stage is " Don't " ! But it is useless to try to discourage someone who feels that he must act, although the chances of his becoming famous are slim. The normal way to begin is to go to a drama school. Then the young actor or actress takes up work with a theatrical company, usually as an assistant stage manager. This means doing everything that there is to do in the theatre:painting scenery, publicity (宣传) , taking care of the costumes (舞台服装) , and even acting in very small parts. It is very hard work indeed. The hours are long and the salary is tiny.

Of course, some people have remarkable chances which lead to fame and success without this long and hard training. Connie Pratt, for example, was just an ordinary girl working in a bicycle factory. A film producer happened to catch sight of her one morning waiting at a bus stop, as he drove past in his car. He stopped and asked if she would like to go to the film studio to do a test, and she thought he was joking. It took the producer twenty minutes to convince Connie that he was serious. The test was successful. And within a few weeks she was playing the leading part opposite one of the most famous actors of the day. But chances like this happen once in a blue moon!

From the very beginning, the author puts it clearly that acting is a profession______.

A．for ambitious people only

B．for young people only

C．too difficult for young people

D．sought after by too many people

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