As we know, DNA testing is very useful for crime fighting. But now crime fighters could have a new tool at hand. Researchers have developed a cutting-edge technique to identify human hair. Their test 题目和参考答案——青夏教育精英家教网—

题目内容

As we know, DNA testing is very useful for crime fighting. But now crime fighters could have a new tool at hand. Researchers have developed a cutting-edge (前沿的) technique to identify human hair. Their test is quicker than DNA analysis techniques currently used by the police.

DNA testing is commonly used for identification because DNA is unique to each individual. However, environmental and chemical processes can degrade(降解) DNA, limiting its usefulness over time. Protein (蛋白质) in hair, on the other hand, is more stable than DNA but can also have variations (变异体) that may be unique to the individual.

“Our analysis process can be used universally, ”says Ms. Huang, “One of our samples even included dyed hair and the test was 100 per cent accurate. The test was able to distinguish East Asians, Caucasians and South Asians.”

Dr. Beauchemin says she has got in touch with law enforcement agencies about using the new technology. She is also planning to collect more hair samples and continue her research with a goal of finding where exactly in the world hair sample is from, to look for more races and determine specific age.

“We are in a very similar place with protein-based identification to where DNA testing was during the early days of development,” said chemist Brad Hart. “This method will be a game-changer, and while we’ve made a lot of progress toward improving it, there are steps to go before this new technique is able to reach its full potential.”

1.What’s the main purpose of the text?

A. To analyze crime scenes.

B. To distinguish different races.

C. To show the usefulness of DNA testing.

D. To introduce a new identification method.

2.Which will be the most useful in identifying a person according to Brad Hart?

A. Chemical materials. B. Protein in hair.

C. DNA variations. D. Blood sample.

3.What’s the advantage of the protein-based identification over DNA testing?

A. Stability. B. Popularity.

C. Security. D. Convenience.

4.What can be inferred from the last paragraph of the text?

A. DNA testing will soon reach its full potential.

B. Protein-based identification remains to be improved.

C. Protein-based identification has replaced DNA testing.

D. DNA testing develops as rapidly as protein-based identification.

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相关题目

Last October, while tending her garden in Mora, Sweden, Lena Pahlsson pulled out a handful of small 1.(carrot) and was about to throw them away .But something made her look closer ,and she noticed a 2.(shine) object .Yes ,there beneath the leafy top of one tiny carrot was her long-lost wedding ring.

Pahlsson screamed 3. loudly that her daughter came running from the house .“she thought I had hurt 4.(I),” says Pahlsson.

Sixteen years 5.(early), Pahlsson had removed the diamond ring 6.(cook) a meal. When she wanted to put the ring back on later, it was gone. She suspected that one of her three daughters-then ten. eight, and six-had picked it up, but the girls said they hadn’t. Pahlsson and her husband 7.(search) the kitchen, checking every corner, but turned up nothing. “I gave up hope of finding my ring again," she says. She never replaced it.

Pahlsson and her husband now think the ring probably got 8.(sweep) into a pile of kitchen rubbish and was spread over the garden, 9. it remained until the carrot’s leafy top accidentally sprouted (生长) through it. For Pahlsson, its return was 10. wonder.

Rainforests, it turns out, are not created equal. Take the Amazon rainforest, an area that covers about 7 million square kilometers. But within that huge expanse are all kinds of ecological zones, and some of these zones, says Greg Asner, are a lot more crowded than others.

“Some forests have many species of trees,” he said, “others have few. Many forests are unique from others in terms of their overall species composition…” And all of these different small areas of forest exist within the giant space that is the Amazon Rainforest.

So Asner, using the signature technique called airborne laser-guided imaging spectroscopy, began to map these different zones from the air. “By mapping the traits of tropical forests from above,” he explains, “we are, for the first time, able to understand how forest composition varies geographically.”

The results show up in multicolored maps, with each color representing different kinds of species, different kinds of trees, the different kinds of chemical they are producing and using, and even the amount of biodiversity, the animal and plant species that live within each zone.

Armed with this information, Asner says decision-makers now have “a first-time way to decide whether any given forest geography is protected well enough or not. If not, then new protections can be put in place to save a given forest from destruction.”

Asner says the information is a great way for decision-makers to develop a “cost-benefit ratio type analysis.” Conservation efforts can be expensive, so armed with this information, government leaders can ensure they are making the most of their conservation dollars by focusing on areas that are the most biologically diverse or unique.

The next step, Asner says, is to take his project global, and to put his eyes even higher in the sky, on orbital satellites. “The technique we developed and applied to map Peru is ready to go global.” Asner said. “We want to put the required instrumentation on an Earth-orbiting satellite, to map the planet every month, which will give the best possible view of how the world’s biodiversity is changing, and where to put much needed protections.

1.Unequally-created rainforests refer to the fact ______.

A. how crowded they are

B. where they are located

C. when they came into being

D. what kinds of species they have

2.What can government leaders learn from Asner’s mapping?

A. The cost to conserve forests.

B. The chemicals needing for certain forests.

C. The forest areas needing special protection.

D. The number of animals living in a forest.

3.What is Asner planning to do now?

A. To send a satellite to map the world.

B. To track the change of biodiversity in the world.

C. To develop technology for mapping the globe.

D. To advertise his project around the world.

4.What does the passage mainly talk about?

A. Using eyes in the sky to map biodiversity.

B. Making a map of big forests in the world.

C. Learning about the biodiversity of Amazon forest.

D. Protecting the forest from being destructed.

Traditional fairytales are being abandoned by parents because they are too scary for their young children, a study found.

Research revealed one in five parents has ________ old classics such as Snow White and the Seven Dwarves and Rapunzel （长发公主）in _______of more modern books. One third of parents said their children have been left in_____after hearing the horrible details of Little Red Riding Hood. And nearly half of mothers and fathers ______ to read Rumplestiltskin （纺织姑娘）to their kids as the ________ of the story are kidnapping and killing. ______, Goldilocks and the Three Bears was also a tale likely to be________ on the book shelf as parents felt ______ condones（宽恕）stealing.

The ______ of 2,000 adults was commissioned（委任） to_______ the launch of the hit US drama GRIMM,_____starts tonight at 9 p.m. on Watch, and sees six pieces________on traditional fairytales. The poll found a quarter of parents polled wouldn’t ________ reading a fairytale to their child until they had ________ the age of five. And 52 percent of the parents said Cinderella didn’t send a good _________to their children as it describes a young woman _________housework all day.

Steve Hornsey, General Manager of Watch, said: “Bedtime stories are supposed to comfort children and send them off to __________soundly.

Fairytales can be dark and dramatic tales so it’s _________that parents worry about reading them to young children. The study also found two thirds of mums and dads try to ________stories which might give their children nightmares. ________, half of parents said traditional tales are more likely to have a strong moral message than a lot of modern kids’ books, such as The Gruffalo, The Hungary Caterpillar and the Mr. Men books.

1.A. taken up B. put up C. brought up D. given up

2.A. favour B. memory C. honor D. spite

3.A. need B. tears C. debts D. surprise

4.A. agree B. intend C. refuse D. enjoy

5.A. problems B. questions C. sentences D. themes

6.A. Similarly B. Fortunately C. Suddenly D. Immediately

7.A. arranged B. left C. clarified D. sorted

8.A. he B. she C. it D. its

9.A. report B. suggestion C. decision D. survey

10.A. draw B. mark C. paint D. pull

11.A. that B. what C. when D. which

12.A. depended B. stuck C. based D. fixed

13.A. pretend B. consider C. want D. imagine

14.A. arrived B. got C. reached D. increased

15.A. letter B. card C. email D. message

16.A. doing B. cleaning C. making D. taking

17.A. play B. work C. sleep D. school

18.A. understandable B. uncomfortable C. unbelievable D. unchangeable

19.A. read B. avoid C. recite D. repeat

20.A. Therefore B. Besides C. Otherwise D. However

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共10处语言错误，每句最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者(从第11处起)不计分。

Studying at an university in the UK have been a good experience for me. When I first arrived, I find life very hard as I didn’t know anybody here, but I soon got to know other Chinese student. Later I became accustomed to talk with people from various cultures. Besides, I made fewer friends.

During my study, I chose to live in with my classmates in the dormitory. I think it’s better than living in a British family because I can meet people from different countries easy. The courses here are excellent. I enjoy the way the teachers give lessons. We encouraged to think for ourselves, which is quite different from that I have experienced before.

Since a university education in the United States 1.(be)very expensive, most students work in addition to studying. Students 2.(usual)work part-time, but some students take full-time jobs.

A typical job for a students would be working 3.a waiter or waitress. Other typical off-campus jobs would include being a clerk in a store or delivering pizza. Sometimes students also find jobs on campus such as cleaning, working in a cafeteria or library or answering 4.(telephone). Most student jobs are entry-level and low paying, but have flexible schedule5.(allow) students to attend classes.

Sometimes students also hold more responsible positions such as managers, or if they are lucky, positions in their area of study, 6.they hope will help them find employment after they graduate.

7.double responsibilities of working and studying result in a very busy,8.(stress)life for some students. 9., it is the only way for many people to finance their college educations. Some Americans believe that the work experience is good for the students 10.(they)since it gives them a taste of “the real world” outside the school.

你校学生会需招聘一名留学生做英语学习顾问，请你以短文形式写一则招聘启事。内容主要包括：

——母语是英语，汉语流利者优先

——解答英语学习问题，协助组织英语活动

——每周4小时，报酬面议

——联系人：李华(Tel.13011223344)

注意：1.词数100左右；

2.可以适当增加细节，以使行文连贯；

3.启事标题和结尾已为你写好。

English Study Advisor Wanted

____________________________________________________________________________________________

__________________________________________________________________

Students' Union

Yucai High School

---Do you know where David is? I couldn’t find him anywhere.

---Well. He ____ have gone far---his coat’s still here.

A. shouldn’t B. mustn’t

C. wouldn’t D. can’t

HOLIDAY FUN AT THE POWERHOUSE

500 HARRIS STREET ULTIMO·TELEPHONE (02) 9217 0111

Join in the holiday fun at the Powerhouse this month linked to our new exhibition，Evolution & Revolution：Chinese dress 1700s to now.DON’T FORGET our other special event，the Club Med Circus School which is part of the Circus(马戏团)！150 years of circus in Australia exhibition experience!

◆Chinese Folk Dancing：Colorful Chinese dance and musical performances by The Chinese Folk Dancing School of Sydney.Dances include：the Golden stick dance and the Chinese drum dance.A feature will be the Qin dynasty Emperor’s court dance.Also included is a show of face painting for Beijing opera performances.

Sunday 29 June and Wednesday 2 July in the Turbine Hall，at 11：30 am & 1：30 pm.

◆Australian Chinese Children’s Arts Theatre：Wellknown children’s play experts from Shanghai lead this dynamic youth group.Performances include Chinese fairy tales and plays.

Thursday 3 to Sunday 6 July in the Turbine Hall，at 11：30 am & 1：30 pm.

◆Chinese Youth League：A traditional performing arts group featuring performance highlights such as the Red scarf and Spring flower dances，and a musician playing Er Hu.

Sunday 6 to Tuesday 8 July in the Turbine Hall，11：30 am to 1：30 pm.

◆Kids Activity：Make a Paper Horse：Young children make a paper horse cut?out.(The horse is a frequent theme in Chinese painting，indicating a kind of advancement.)Suitable for ages 8～12 years.

Saturday 28 June to Tuesday 8 July in the Turbine Hall,12：00 pm to 1：00 pm.

◆Club Med Circus School：Learn circus skills，including the trapeze，trampolining and magic.Not only for children over 5.There are 40 places available in each 1 hour session and these must be booked at the front desk，level 4，on the day.

Tuesday 1 to Saturday 5 July at 11：30 am & 1：00 pm.

Enjoy unlimited free visits and many other benefits by becoming a Family member of the Powerhouse.Our family memberships cover two adults and all children under the age of 16 years at the one address.

Members receive Powerline，our monthly magazine，discounts in the shops and the restaurants，as well as free admission to the Museum.All this for as little as 50.00 a year！Call (02) 9217 0600 for more details.

1.When can you watch the Chinese drum dance?

A. On July 2. B. On July 3.

C. On July 6. D. On July 8.

2.To learn the magic tricks，you can go to .

A. Kids Activity

B. Chinese Youth League

C. Club Med Circus School

D. Children’s Arts Theatre

3.What is required if you want to enjoy free visits to the Museum?

A. Calling (02) 9217 0600.

B. Gaining family membership.

C. Coming for the holiday fun.

D. Paying Powerline 50.00 a year.

4.What is the main purpose of the text?

A. To attract visitors.

B. To present schedules.

C. To report the performances.

D. To teach kids Chinese arts.

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