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.
高二英语阅读理解中等难度题
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.
高二英语阅读理解中等难度题查看答案及解析
As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.
A. the; a B. a; a
C. /; a D. /; the
高二英语单项填空中等难度题查看答案及解析
短文改错
As we all know , walking is an useful way of exercising and is beneficial to our health. It can not only reduce the risk of many kinds of diseases but also builds up the bones. It’s safe than many other ways of exercising, especially for the elderly and it’s easy to do without consider rules. Beside, walking can also help us lose weight.
What should we pay attention during the walk? First, we should wear loose clothes or good shoes so that we can relax. Second, we should walk fast enough to cause us to breath with difficulty but still be able to talk. Third, that is very important to walk with our arms moving freely. Most important, we should do it every day.
高二英语短文改错简单题查看答案及解析
As we all know, one unfortunate outcome of Internet use is that it damages people’s ability _______ normal lives.
A. living B. to live
C. lived D. to be lived
高二英语单项填空中等难度题查看答案及解析
_________ English can be difficult to learn, it is a very useful tool for communication.
A. As B. When
C. While D. Because
高二英语单项填空中等难度题查看答案及解析
As we know, language is one of the significant means for mankind to thoughts and feelings.
A. drive B. convey C. deliver D. transport
高二英语单项填空中等难度题查看答案及解析
As we all know, ________life is hard for any of us.If we want to live________happy life,we must work harder.
A./;/ B./;a C.a;/ D.a;a
高二英语单项填空中等难度题查看答案及解析
As we all know, the father __________ for the spoilt child.
A. is to blame B. is to be blamed
C. blamed D. blames on
高二英语单项填空中等难度题查看答案及解析
As nobody here knows what is wrong with the machine, we must send for an engineer to ____ the problem.
A.handle B.raise C.face D.present
高二英语单项填空中等难度题查看答案及解析
As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.
A. handle B. raise C. face D. present
高二英语单项填空中等难度题查看答案及解析