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sectionⅡ Reading Comprehension--Part B

发布时间：2006-07-08 14:46 点击：

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　　46） In an era when headlines shout about the latest cancer scare, Ames has a different message: the levels of most manmade carcinogens are generally so low that any danger is trivial compared with the levels of natural carcinogens.

　　Ames is not a quack. At age 59, he is one of the nation’s most respected authorities on carcinogenesis. 47） His resume is packed with honors, including the Charles S.Mott Prize from the General Motors Cancer Research Foundation, one of the most prestigious awards in cancer research, and membership in the National Academy of Sciences. Even his critics say the Ames test-his simple, inexpensive laboratory procedure that helps determine whether a substance might cause cancer-is a remarkable achievement.

　　Ames’s cancer research began about 25 years ago over a bag of potato chips. Ames, then conducting research for the National Institutes of Health in Maryland, was reading the ingredients on the bag. 49） It struck him that no one knew what each chemical did to human genes, and there was no easy way to find out.

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