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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. 答案是B，但我认为A对 此题的结论是，hypothesis is correct.而hypothesis是：venereal disease caused his deafness，也就说要保证贝多芬得过V病。 推理过程：mercury-->had ingested mercury-->ververeal disease-->deafness 对A选项取非，就是说有可能在头发里没有检测到水银，仍有可能推出曾经注射过，因此得过V，造成了耳聋。即m否--〉deafness. 因此，A是结论成论的保证。 而B选项，最多能保证注射水银是为了治V病， 因为不是每个那时代的人都注射。但m治v是文中给的客观事实，无须证明。此题要保证的是贝多芬得过V病。
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发表于 2006-7-25 10:41:00
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