An Australian-based scientist announced yesterday he had made a step forward in forensic(用于法庭的) DNA testing so that an individual can be identified by a single cell.
Ian Findlay from the Australian Genome Research Facility at the University of Queensland, said current DNA testing required 200 to 500 cells to gain a similar level of accuracy.
“What we have done has brought that down to one cell,” Dr.Findlay said after releasing details of his DNA testing technique at a Sydney conference.
The technology could allow investigators to pick up DNA identities from plastic cards and even build up a complete history of the people who have handled a paper document.
“You’d have to wear a space suit to stop yourself from leaving traces.You can identify cells on the paper, so you can work out where it’s come from and who’s touched it.” he said.
The technique could also be used to trace the thrower of a punch from cells left Behind on the skin of their victim.Even the wearing of latex gloves would not help; small cells can pass through the gloves, and the constant flow of genetic material given off by the human body would leave further evidence.
“we gained a skin cell from a document dating back 30 years and managed to gain a DNA fingerprint.DNA evidence can remain fresh for decades, perhaps even centuries.” Dr.Findlay said.
“The potential for this technology to solve unsolved crimes is great.” he said.
But Dr.Findlay, named scientist of the year in 1998 by the European Society of Human Genetics, said the new testing needed to be scientifically validated, which would take up to five years.
He said, “These are serious consequence taking on technology too early.The public has to be sure that they have the utmost confidence in the security and court systems.”
1.The main advantage of the new technology is that .
A.a(chǎn) single cell can identify an individual
B.it has brought down the cost of DNA testing
C.a(chǎn) higher level of accuracy can be acquired with a single cell
D.it needs less than 200 cells to gain a certain level of accuracy
2.The underlined word “validated” means “ ” .
A.confirmed B.imagined C.supposed D.criticized
3.According to Ian Findlay, the new technology can .
A.help to keep DNA evidence fresh for decades and even centuries
B.make the process of DNA testing much more simplified
C.help to pick up DNA identities more easily
D.be wildly used in five years at most
4.The last paragraph suggests that .
A.the immediate adopting of the technology may cause mistakes
B.the public have acknowledge the new testing technology
C.it is safe to put the new technology into use now
D.Dr. Findlay is quite sure of his new technology
5.The aim of the passage is to .
A.praise Ian Findlay for his work
B.report a piece of interesting news
C.inform us of the wide use of DNA testing
D.tell us a recent improvement in DNA testing
科目:高中英語 來源: 題型:
---Did you have _______fun in Australia?
--- Sure. It was ___________ unforgettable experience.
A.a; an B. 不填;the C. the; an D. 不填; an
查看答案和解析>>
科目:高中英語 來源:2012-2013學(xué)年江西南昌10所省高三第二次模擬突破沖刺(七)英語試卷(解析版) 題型:閱讀理解
Once in a blue moon,(極為罕見) there is one on New Year's Eve. Revelers ringing in 2010 will be treated to a so-called blue moon. According to popular definition, a blue moon is the second full moon in a month. But don't expect it to be blue - the name has nothing to do with the color of our closest celestial(天空的) neighbor. A full moon occurred on December 2. It will appear again on Thursday in time for the New Year's countdown.
The New Year's Eve blue moon will be visible in the United States, Canada, Europe, South America and Africa. For partygoers in Australia and Asia, the full moon does not show up until New Year's Day, making January a blue moon month for them.
A full moon occurs every 29.5 days, and most years have 12. On average, an extra full moon in a month - a blue moon - occurs every 2.5 years. The last time there was a lunar double take was in May 2007. New Year's Eve blue moons are rarer, occurring every 19 years. The last time was in 1990; the next one won't come again until 2028.
“Blue moons have no astronomical significance,” said Greg Laughlin, an astronomer at the University of California. “`Blue moon' is just a name in the same sense as a `hunter's moon'(a full moon in octorber) or a `harvest moon,'” Laughlin said in an e-mail.
The popular definition of blue moon came about after a writer for Sky & Telescope magazine in 1946 misinterpreted the Maine Farmer's Almanac and labeled a blue moon as the second full moon in a month. In fact, the almanac(年歷) defined a blue moon as the third full moon in a season with four full moons.
1.What’s the color of blue moon?
A.blue B.golden C.green D.red
2.If you are in China, in which month can you see the blue moon?
A.December, 2009 B.November, 2009
C.January, 2010 D.February, 2010
3.Compared with the hunters moon, the blue moon ________ .
A.is more beautiful B.is rarer C.is larger D.is brighter
4.Which full moon should be called blue moon according to the original definition?
A.The second full moon in a month with two full moons.
B.The third full moon in a month with three full moons.
C.The second full moon in a season with four full moons.
D.The third full moon in a season with four full moons.
5.What would be the best title for the passage ?
A.Rare New Year’s Eve Blue Moon to Ring in 2010
B.Blue Moon to Take Us Good Fortune
C.The Best Time to Observe Blue Moon
D.The Reason for Blue Moon’s Appearing
查看答案和解析>>
科目:高中英語 來源:2014屆福建省高一下學(xué)期期末聯(lián)考英語試卷(解析版) 題型:閱讀理解
Australia has passed regulations that will enable more international students to further their education in the country.
The new measures were released by the Australian Department of Tertiary Education, Skills, Jobs and Workplace Relations in September and will take effect in mid-2012.
As a result, the student visa(簽證) application process for overseas students has been simplified, and the deposit(押金) required to study in Australia has been reduced. Language requirements for overseas students have also been eased.
Also, overseas students receiving a higher education in Australia will be given a working visa lasting from two to four years after graduation, as long as they meet the basic IELTS requirement.
“This change will definitely make Australia a more attractive destination for Chinese students planning to study overseas,” says Wang Lan, an expert from Education International Cooperation Group(EIC), a Beijing-based company that provides services to students wishing to study overseas.
However, in the past few years, many of Wang's student clients(客戶) could not start studies in Australia because they did not meet the language requirements, visa processing took a long time and deposit regulations were difficult. The change in policy is good news for the parents of students wishing to study in Australia, Wang says.
A 22-year-old female student surnamed Li, in Beijing, who is planning to do her postgraduate studies in Australia, learned about the policy change several weeks ago.
“According to the previous deposit requirement for my student visa, my family was required to put down 550,000 yuan($86,850). Now we only need to prepare 410,000 yuan. This is a relief for my parents,” Li says.
She also says that the two to four years working visa makes her feel much clearer about her study plans.
“I believe several years of working experience abroad will strengthen my competitiveness when I return to China,” she says.
Gaining a competitive advantage is the major reason for Chinese students to study abroad, according to the report by EIC.
1.What’s the main idea of the passage?
A. Language requirement for overseas students have been eased in Australia.
B. Australia is a most attractive place for students in China.
C. Australia widens window of opportunity for international students.
D. More students will work in Australia after their graduation.
2.After the new regulations are passed, .
A. more students will come to Australia to work
B. more Chinese students will choose to live in Australia
C. the opportunities to work in Australia decrease for overseas students
D. more Chinese students will choose to further their education in Australia
3.How much can Li’s parents save according to the new regulations?
A. 550,000 yuan. B. 140,000 yuan. C. 410,000 yuan. D. 86,850 yuan.
4.Why do many students want to work in Australia after their graduation?
A. The working experience abroad will strengthen their competitiveness.
B. They can earn more money in Australia.
C. Their working experience can make them stay in Australia forever.
D. They have to do so according to the new regulations.
查看答案和解析>>
科目:高中英語 來源:2011-2012學(xué)年甘肅省高三第二次檢測英語試卷(解析版) 題型:閱讀理解
Ireland has had a very difficult history. The problems started in the 16th century when English rulers fried to conquer(征服) Ireland. For hundreds of years, the Irish people fought against the English. Finally, in 1921. The British government was forced to give independence to the south of Ireland. The result is that today there are two “Irelands”. Northern Ireland. In the north, is part of the united kingdom. The republic of Ireland. In the south. Is an independent country.
In the 1840s the main crop, potatoes ,was affected by disease and about 750,000 people died of bunger. This, and a shortage (短缺) of work , forced many people to leave Ireland and live in the USA, the UK, Australia and Canada. As a result of these problems, the population fell from 8.2 million in 1841 to 6.6 million in 1851.
For many years, the majority of Irish people earned their living as farmers. Today, many people still work on the land but more and more people are moving to the cities to work in factories and offices. Life in the cities is very different from life in the countryside, where things move at a quieter and slower pace.
The Irish are famous for being warm-hearted and friendly, Oscar Wilde, a famous Irish writer, once said that the Irish were “the greatest talkers since the Greeks”, Since independence, Ireland has revived(復(fù)興) its own culture of music, language, literature and singing. Different are as have different styles of old Irish song which are sung without instruments. Other kinds of Irish music use many different instruments such as the violin, whistles, etc.
1.what does the author tell us in paragraph 1 ?
A. how the Irish fought against the English.
B. how Ireland gained independence.
C. how English rulers tried to conquer Ireland.
D. how two ”Irelands” came into being.
2.we learn from the text that in Ireland____________.
A. food shortages in the 1840s led to a decline in population
B. people are moving to the cities for lack of work in the countryside
C. it is harder to make a living as a farmer than as a factory worker
D. different kinds of old Irish songs are all sung with instruments
3.the last paragraph is mainly about____________.
A. the Irish character
B. Irish culture
C. Irish musical instruments
D. a famous Irish writer
4.what can be the best title for the text?
A. Life in Ireland B. A very difficult history
C. Ireland, past and present D. the independence of Ireland
查看答案和解析>>
科目:高中英語 來源:福建省20092010學(xué)年高二下學(xué)期期末考試試題(英語) 題型:閱讀理解
Identifying young people with the potential to be great athletes has become a serious, business around the world. Many countries, including Australia, have sophisticated(復(fù)雜) programs for identifying and nurturing(培養(yǎng)) talent.
The AIS (Australian Institute of Sport) already runs a program that identifies potential winners starting from the age of 12 based on their physical and physiological(生理的) abilities.
Could genetics improve these programs? The problem is that no one gene test is ever going to do an accurate job of identifying someone with the physical attributes of a sporting champion, says Professor North.
"We can think of the elite athlete as what I'd call a complex phenotype(表現(xiàn)型)," she says. “There are going to be a large number of different genes involved. Any one single test is unlikely to be highly predictive.”
Professor Peter Fricker, director of the AIS, agrees. Although he is intrigued in the possibilities of genetic testing, he says using such tests to identify athletes would be difficult. "The feeling I have is that it won't be that easy," he says. "Talent selection is not just about your genes."
Since 2004, the AIS has been forbidden by government from any involvement in genetic work, including genetic testing. But Professor Fricker thinks that is likely to change in the near future. "There's been a shift in view more recently," he says.
When it does, the AIS will resume its work on the genetics of sports performance, Professor Fricker says. They would be particularly interested in looking for more genes that might help shape elite performance, but also for genes that increase the risk of injury.
Last year, the Human Genetics Society of Australasia issued a position statement on gene testing for sport, after concerns that people could use tests to steer children into particular sports.
“The Human Genetics Society thinks there are not enough data to use these tests for determining what sport kids should do,” said Professor David Thorburn, president of the society.
He stressed that genetic tests should not be performed on children, except in very specific medical circumstances.
57.The aim of the AIS’s program is to .
A.predict how genes are connected with injuries
B.find potential great athletes
C.find out what qualities a professor has through gene tests
D.turn an athlete into a champion by transferring genes
58.By saying “Talent selection is not just about your genes”, Fricker means .
A.effort is more important than genes in most cases
B.you can’t choose an athlete just depending on genes
C.to research one’s genes takes a long time
D.most people don’t believe in genetic tests
59.The underlined word “resume” in Para. 7 can be replaced by .
A.stop B.complete C.reduce D.continue.
60.What’s Professor David Thorburn’s attitude towards genetic tests?
A.Genetic tests have a negative effect on children.
B.Genetic tests, under certain conditions, can be conducted on children.
C.Genetic tests can reduce the risk of athletes’ injuries.
D.People could use genetic tests to decide what sport kids should take.
查看答案和解析>>
湖北省互聯(lián)網(wǎng)違法和不良信息舉報平臺 | 網(wǎng)上有害信息舉報專區(qū) | 電信詐騙舉報專區(qū) | 涉歷史虛無主義有害信息舉報專區(qū) | 涉企侵權(quán)舉報專區(qū)
違法和不良信息舉報電話:027-86699610 舉報郵箱:58377363@163.com