2. 外语
  3. An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answe

An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answe

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问题 An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
    Which of the followings can be the results of Ames tests?
    Man-made carcinogens are much more dangerous than natural carcinogens.
Answer Choices
A. Half of all chemicals—both man-made and natural—turned out to be potentially carcinogenic.
B. A glass of wine or beer is more likely to cause cancer than a glass of polluted water in the Silicon Valley.
C. Daily consumption of the average peanut-butter sandwich is no more dangerous than the intake of DDT.
D. Natural carcinogens are less dangerous than man-made carcinogens.
E. The danger of man-made carcinogens is trivial compared with those natural carcinogens.
F. People should keep the total exposure to carcinogens as low as possibl
选项
答案A. Half of all chemicals-both man-made and natural-turned out to be potentially carcinogenic. B. A glass of wine or beer is more likely to cause cancer than a glass of polluted water in the Silicon Valley. E. The danger of man-made carcinogens is trivial compared with those natural carcinogens.
解析 本题为篇章总结题，考查考生理解全篇中心思想和相关重要信息的能力，考生通过区分主要观点和次要观点以及文章中没有提及的观点达到总结全篇的目的。读文章后可以发现，上述三个句子很好地概括了Ames的研究结论，而另外三个句子则与原文内容不符合。
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