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Substances suspected of causing cancer, if carefully administered to experimental animals in quantities in which those substances are ordinarily present in the environment, are virtually guaranteed not to produce cancer at rates significantly above the chance levels. The most economical procedure for obtaining informative data is to administer vastly increased amounts of the substance being tested.

The economical procedure described above will not be an effective one if which of the following is true?

(A) Cancer data on experimental animals yield accurate estimates of the risk of cancer for human beings.

(B) Experimental animals will often develop cancer in response to receiving excessive quantities of a substance regardless of the specific properties of the substance.

(C) When more of a possibly cancer causing substance is administered to experimental animals fewer animals are needed for significant data to be obtained.

(D) Among experimental animals the chance levels for many types of cancer is virtually zero.

(E) Substances will virtually be tested in amounts greater than necessary to obtain informative data
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应该不是B,如果B对,那么应该改成regardless of the specific AMOUNTS of the substance.关键是致癌物质的数量,而不是致癌物质的特性。

我觉的是D,本文的前提是是致癌物质的数量多少,导致了是否是致癌,因而那个economical procedure 是指监控致癌物质的数量增长,而D指的是有这个物质就致癌,那么economical procedure 的前提基础就不存在了。所以无效。

A是支持观点的
C完全无关
E说的好像是致癌物质的种类,而不是数量水平。

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只有b and e有关,而后者的greater与原文的程度不一样。
世界上没有一样东西可以取代毅力,才干不可以,怀才不遇者比比皆是,一事无成的天才很普遍;教育也不可以,世上充满了学而无用的人.只有毅力和决心无往而不胜.

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b加强,e削弱

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