蛋白质主要以下列哪种形式吸收（）。 A.多肽 B.寡肽 C.二肽和三肽 D.氨基酸

聚山梨酯类表面活性剂一般具有（）

A.增溶作用

B.助溶作用

C.润湿作用

D.乳化作用

E.杀菌作用

C

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.

62. 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

63. 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

64. 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.

65. 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

肝糖原合成中葡萄糖载体是（）。

A.CDP

B.ADP

C.UDP

D.TDP

E.GDP

头颅平片常顶枕区沿脑沟、脑回弧条状钙化（）

A.神经纤维瘤变

B.结节性硬化

C.脑颜面血管瘤病

D.胼胝体发育不良

E.前脑无裂畸形

轧钢机的齿轮机座的齿轮轴和万向接头扁头应采用热装法。