《研究生英语精读教程》(第三版·上) Unit TwoCancer & Chemicals...

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《研究生英语精读教程》(第三版·上); Unit Two;Cancer Chemicals;implement※ v. carry out执行proposition△ n. a suggested offer, arrangement or settlement提议，提案;[ 2 ] A day of esoteric﹡science and incomprehensible jargon﹡was predicted. But Bruce Ames①, chairman of the department of biochemistry at the University of California at Berkeley, had plans to liven the proceedings.;[ 4 ] The whole world is chock-full of carcinogens, Ames declared. “A beer, with its 700 parts per billion of formaldehyde﹡ and five parts per 100 of alcohol is a thousand times more hazardous than anything in the water. If you have beer on your breath, does that mean you have to warn everyone who comes within ten feet of you? [ 5 ] 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.;[ 6 ] Ames is not a quack. At age 59, he is one of the nation s most respected authorities on carcinogenesis. His resume is packed with honors, including the Charles. Mott Prize① from the General Motors Cancer Research Foundation②, one of the most prestigious awards in cancer research, and membership in the National Academy of Sciences③. ;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.;[ 7 ] But Ames slaughters﹡ sacred cows﹡. He s taking on the environmental movement, which some have called the single most important social movement of the 20th century. In April 1987, for instance, he and two colleagues, Renae Magaw and Lois Swirsky Gold, published a report in Science magazine that ranked various possible cancer risks.;Based on animal tests of nearly 1,000 chemicals, the data show that daily consumption of the average peanut-butter sandwich, which contains traces of aflatoxin ﹡ (a naturally occurring mold carcinogen in pean