21. Historian: We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton’s psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct.
Which one of the following is an assumption on which the historian’s argument depends?
(A) None of the mercury introduced into the body can be eliminated.
(B) Some people in Beethoven’s time did not ingest mercury.
(C) Mercury is an effective treatment for venereal disease.
(D) Mercury poisoning can cause deafness in people with venereal disease.
(E) Beethoven suffered from psychological problems of the same severity as Newton’s.
answer is b . but why not A作者: stoneren 时间: 2003-4-18 06:59
原题的逻辑推理为：
条件：如果发现头发里有m + m是用来治疗v-disease的
结论：v-disease导致耳聋（换言之：B得了v-disease）
其实本题结论的一个前提是：m仅仅是用来治疗v-disease的，而无其他用途
B取非得：B时代的所有人都ingest mercury，这个条件必定无法推出结论，因为不可能所有的人都有v-disease
A取非：mercury introduced into thye body can be eliminated与原文中的条件不冲突，所以不起作用
对于assume的题目，如果确定不了的可以用取非的方法来确定答案。作者: oddyuibe 时间: 2003-4-18 23:19
to stoneren,
好清晰的解释~作者: oddyuibe 时间: 2003-4-22 22:27
我觉得A选项中的None太绝对化了
~
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