【題目】根據(jù)短文理解，選擇正確答案。
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 (蛋白質(zhì)) in hair, on the other hand, is more stable than DNA but can also have variations (變異體) 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.

【答案】
（1）D
（2）B
（3）A
（4）B
【解析】本文主要介紹了一種比DNA更快捷準(zhǔn)確的通過鑒別頭發(fā)中的蛋白質(zhì)來偵破犯罪的新科技。

⑴D推理判斷題。根據(jù)第一段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.和下文的詳細(xì)描述可知，本文主要是介紹一種比DNA更快捷準(zhǔn)確的通過鑒別頭發(fā)中的蛋白質(zhì)來偵破犯罪的新科技，故選D。

⑵B細(xì)節(jié)推理題。根據(jù)最后一段“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.可知Brad Hart認(rèn)為鑒別一個(gè)人最有效的是頭發(fā)的蛋白質(zhì)，故選B.

⑶A細(xì)節(jié)推理題。根據(jù)第二段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 (蛋白質(zhì)) in hair, on the other hand, is more stable than DNA but can also have variations (變異體) that may be unique to the individual.可知，DＮA較難保存，容易講解，而頭發(fā)中的蛋白質(zhì)比DＮA更加穩(wěn)定，而且蛋白質(zhì)也有變異，也可能是個(gè)人獨(dú)有的，所以蛋白質(zhì)鑒別比DNA鑒別更穩(wěn)定，故選A。

⑷B推理判斷題。根據(jù)最后一段“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.”可知，通過化學(xué)家Brad Hart的話可知這種蛋白質(zhì)鑒定技術(shù)還處于早期發(fā)展階段，如同DNA檢測技術(shù)的早期階段一樣，還需要不斷提高，來充分發(fā)揮其潛能。故選B。

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