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标题: 狒狒21题 [打印本页]

作者: centennial 时间: 2009-10-5 20:20 标题: 狒狒21题

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.

原解释There should be 2 assumptions to support the hypothesis. The 1st assumption of the author is that only venereal disease will be treated by mercury in Beethoven’s time. The 2nd assumption is only some people in Beethoven's time will ingest mercury, if all people ingest mercury, the evidence is not useful. So, some people in Beethoven's time did not ingest mercury. The answer should be B.

A, E have nothing to do with the argument.

C is not necessary, 'Since mercury was commonly ingested in Beethoven’s time to treat venereal disease' is enough.

D is wrong: according to the author, it is the venereal disease that will cause the deafness, not the mercury poison.

但我觉得应选D,应建立起Deafness和Mercury的关系,B怎么看怎么不能理解

作者: lingdingxiao 时间: 2009-10-6 07:02

不太明白第二个假设，当然是有病才ingest mercury，正常人怎么会没事ingest mercury?

作者: chwayne 时间: 2009-10-6 22:18

我觉得21题是我见过的题中非常难的一个,我分析了半天,
这个题B选项正确, 我希望这是Lsat题, 否则我会在考试时大哭.
假设说贝多芬是因为性病才耳聋. 但是没有证据显示小贝得过性病, 那么why呢? 因为他用水银治疗了, 好了, 所以在他hair里要是有水银说明说明他用水银治疗性病, 是性病导致耳聋, 最后性病好了, 如果所有人都喝水银, 说明水银还有其他用途, 因为不可能所有人用水银都为了治疗性病, 这太恐怖了!!!!所以小贝就不一定是性病导致耳聋. 所以假设错误, 最后要证明假设正确, 有一些没喝水银, 说明水银只有一种功能-治疗那个病.
A不对是因为问你在这个argument 里作者自己的假设. 暗示的不是A. 如果作者想暗示A, 他就会暗示: 如果水银消失, 头发难测, 但小贝能测, 说明作者在假设水银没消失. 但你看看这个argument, 从里到外都没有暗示水银有消失的可能. 你要是感觉到了告诉我.

作者: tangdream 时间: 2009-10-7 07:10

刚想问这题呢！我选的也是D 不过确实也知道D错在哪只是B这答案太扯了……需要用到很多无关推理的感觉请问狒狒逻辑里的都是什么题啊？这题不像GMAT的风格啊

作者: kenlilys 时间: 2009-10-12 06:57

这是一道assumption题

b耳聋，venereal disease会导致耳聋,mercury用来治疗venereal diseases, 所以，如果b头发里面有mercury--->b有venereal diseased

由于文中没有missing conditional chain,是属于defender assumption而不是support assumption

对于这类题目可以用negation technique来double check,但是个人认为也可以用这种方法来选择看起来比较正确的

a)none of 太绝对了，文中没有说全都不会eliminate

b)negated assumption shall be "All people...ingested mercury"这样一来如果b头发里面有mercury也是推不出conclusion了

c)在b的时代是一种治疗方法，但是没有说是现在有效的方法

d)文章没有说到是水银中毒导致耳聋的，只是hypothesize venereal disease导致耳聋的,negated“水银中毒不会导致得了venereal disease得人耳聋”，也不会影响conclusion

所以这类defender题目还是用negation technique

btw.小菜鸟一个，和大家分享，等待高人进一步指点

作者: chenholan 时间: 2009-10-14 06:52

B总算看明白了，可D又错在哪了呢

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