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.
1.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
2.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
3.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.
4.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
科目：高中英语 来源：2012-2013学年四川南充蓬安中学高二下期第二次阶段性考试英语卷（带解析） 题型：单选题
-Did Linda see the traffic accident? -No, no sooner ______than it happened.
| A．had she gone | B．she had gone | C．has she gone | D．she has gone |
查看答案和解析>>
科目：高中英语 来源：2012届山西省山大附中高三第一次模拟考试英语试卷（带解析） 题型：完型填空
This economy has really got a lot of people moving and not always by a choice they wanted to make. My wife and I now find ourselves among those unfortunates feeling that 1 .
At the end of last year, our customers just 2 . We had to make the painful decision to 3 our office and put our house up for 4 . We haven’t lived in it for two years yet and expected it would be the 5 one for a long time. How 6 this world economic mess is changing our lives!
As I get older, I find moving less adventurous and more 7 . This time, we’re in the process of moving without knowing where we’ll 8 next. Job searching has been thrown into the quagmire(困境) of an unsettled life. Both my wife and I had been feeling pretty 9 from all this. I’ve been challenged to find the positive in all this down that’s 10 us.
But then it happened while I watched my wife 11 things up. She’s an absolute whiz(能手) when it comes to packing. I took delight in watching her 12 just the right boxes for 13 in front of her and filling in the 14 with pillows and towels. I began feeling something like a wind lift me up and sail me through my own 15 of the packing and loading.
Some friends will be helping us with the 16 . I’ve told them that they’re not 17 friends but gaining some new vacation spots.
I have 18 that we’ll get through this transition finally. We all will always have work to do, by choice or 19 , and we can also consciously make the effort to create a sense of 20 in a new place.
| 【小题1】 |
|
| 【小题2】 |
|
| 【小题3】 |
|
| 【小题4】 |
|
| 【小题5】 |
|
| 【小题6】 |
|
| 【小题7】 |
|
| 【小题8】 |
|
| 【小题9】 |
|
| 【小题10】 |
|
| 【小题11】 |
|
| 【小题12】 |
|
| 【小题13】 |
|
| 【小题14】 |
|
| 【小题15】 |
|
| 【小题16】 |
|
| 【小题17】 |
|
| 【小题18】 |
|
| 【小题19】 |
|
| 【小题20】 |
|
查看答案和解析>>
科目：高中英语 来源：2013届山东省德州市某中学高三12月月考英语试卷（带解析） 题型：阅读理解
Joe came to New York from the Middle West, dreaming about painting. Delia came to New York from the South, dreaming about music. Joe and Delia met in a studio. Before long they were good friends and got married.
They had only a small flat to live in, but they were happy. They loved each other, and they were both interested in art. Everything was fine until one day they found they had spent all their money.
Delia decided to give music lessons. One afternoon she said to her husband:
“Joe, , I’ve found a pupil, a general’s daughter. She is a sweet girl. I’m to give three lessons a week and get $5 a lesson.”
But Joe was not glad.
“But how about me?” he said.” Do you think I’m going to watch you work while I play with my art? No, I want to earn some money too.”
“Joe, , you are silly,” said Delia. “You must keep at your studies. We can live quite happily on $15 a week.”
“Well, perhaps I can sell some of my pictures,” said Joe.
Every day they parted in the morning and met in the evening. A week passed and Delia brought home fifteen dollars, but she looked a little tired.
“Clementina sometimes gets on my nerves. I’m afraid she doesn’t practice enough. But the general is the nicest old man! I wish you could know him, Joe.”
And then Joe took eighteen dollars out of his pocket.
“I’ve sold one of my pictures to a man from Peoria,” he said, “and he has ordered another.”
“I’m so glad,” said Delia. “Thirty-three dollars! We never had so much to spend before. We’ll have a good supper tonight.”
Next week Joe came home and put another eighteen dollars on the table. In half an hour Delia came, her right hand in a bandage.
“What’s the matter with your hand?” said Joe. Delia laughed and said:
“Oh, a funny thing happened! Clemantina gave me a plate of soup and spilled some of it on my hand. She was very sorry for it. And so was the old general. But why are you looking at me like that, Joe?”
“What time this afternoon did you burn your hand, Delia?”
“Five o’clock, I think. The iron-I mean the soup-was ready about five, Why?”
“Delia, come and sit here,” said Joe. He drew her to the couch and sat beside her.
“What do you do every day, Delia? Do you really give music lesson? Tell me the truth.”
She began to cry.
“I couldn’t get any pupils,” she said, “So I got a place in a laundry ironing shirts. This afternoon a girl accidentally set down an iron on my hand and I got a bad burn. But tell me, Joe, how did you guess that I wasn’t giving music lessons?”
“It’s very simple,” said Joe. “I knew all about your bandages because I had to send them upstairs to a girl in the laundry who had an accident with a hot iron. You see, I work in the engine-room of the same laundry where you work.”
“And your pictures? Did you sell any to that man from Peoria?”
“Well, your general with his Clemantina is an invention, and so is my man from Peoria.”
And then they both laughed.
【小题1】To support the family, Delia worked as .
| A．a tutor | B．a music teacher | C．a laundry assistant | D．an artist |
| A．a man from Peoria liked Joe’s pictures | B．Delia earned $15 dollars a week easily |
| C．Clemantina and the general were kind | D．the couple worked at the same laundry |
| A．The general | B．Clemantina | C．A girl | D．Herself |
| A．Clemantina was an invention of the general |
| B．Clemantina was an invention of the man from Peoria |
| C．the general, Clemantina and the man from Peoria were the couple’s clients |
| D．there were no such men as the general, Clemantina and the man from Peoria |
| A．honest | B．faithful | C．ashamed | D．heartbreaking |
查看答案和解析>>
科目：高中英语 来源：2011届安徽省野寨中学-岳西中学高三上学期联合考试英语卷 题型：阅读理解
BUKHANNON, West Virginia—Two rescue teams slowly moved along a two-mile path on Monday night to the site of a coal mine explosion that trapped 13 miners, who had not been heard from since the early morning accident．
Meanwhile, at a nearby church, more than 250 family members and friends gathered, waiting for updates（最新报道）on the rescuers’ progress．
The miners were trapped at about 6:30 and many families weren’t informed of the accident until about 10 a．m-more than three hours after it happened．“It’s very upsetting, but you’ve got to be patient, I guess,” said John Helms, whose brother, Terry, was trapped in the mine．
The trapped miners were about 260 feet underground and about 10,000 feet from the Sago Mine’s entrance, said Roger Nicholson, general counsel from International Coal Group．
At a late night news conference, Nicholson said one team had advanced about 4, 800 feet in the four hours since entering the mine just before 6 p．m．Another team entered the mine about 30 minutes later．
He said the crew was very experienced, with some members having worked underground for 30 to 35 years．The miners were equipped with about one hour of breathable oxygen each．The company has not released the names of the miners．
The teams test the air about every 500 feet, and have to disconnect （remove） the power to the phones they use to communicate with the surface before doing that．“ We don’t want to be energizing anything if it’s in an atmosphere with burnable gases,” Kips said．
The cause of the explosion was not immediately known．High levels of carbon monoxide were discovered shortly after the explosion, which delayed rescue efforts, but those levels have since subsided（减退）, authorities said．
【小题1】According to the passage, we can infer that ________．
| A．all the miners who were trapped underground were still alive |
| B．communication with the trapped miners was cut off |
| C．the two rescue teams entered the mine at the same time |
| D．the rescue started as soon as the accident happened |
| A．1,000 feet | B．2,400 feet | C．1,200feet | D．4,800feet |
| A．In a magazine． | B．In a newspaper． |
| C．In a science book．． | D．On an advertisement． |
查看答案和解析>>
科目：高中英语 来源：2014届浙江省苍南县灵溪二高高一第一次月考英语试卷（解析版） 题型：单项填空
—When did the great earthquake in Wenchuan happen ?
—It happened __________14:28 __________the afternoon of May 12, 2008.
A．on, in B．at, on C．at, in D．on, on
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
