狒狒逻辑蒙了 21题

yangmars · 发表于 2011-4-18 14:24:14

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.
本题我有一点不懂，题目中的前提是：if mercury is found in his hair conclusion is venereal cause his death.
那么假设应该为 mercury often be used to treat venereal and venereal is the only ill be treated by mercury .right？？
然后，文中已经给了mercury often be used to treat venereal 那么假设就应该是 venereal is the only ill……, 可是解释中说“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,”想问下第二个假设是怎么来的？？只有一部分人用和全部人用友什么区别，只要知道在他的时代，大家都用mercury来治疗花柳不就行了吗

wynyy2000 · 发表于 2011-4-18 15:02:05

首先，对题目的evidence 和conclusion 定位不对，条件是 mercury was commonly ingested in Beethoven’s time to treat venereal disease
结论：如果在B头发里发现mercury,那么就可以证明B患有V这种病
条件，结论间有明显的GAP，如果mercury不仅仅用于治疗V，还可以治其他病，那么结论就不成立；或者如果在B时期, ingest mercury跟我们现在喝板蓝根一样普遍，那么结论也不成立

yangmars · 发表于 2011-4-18 15:20:27

我还是有些疑问，正如楼上所说，文中已经提到了M在B的时代经常被用来治疗V这种病，然后是他头发里如果有M，那么说明他是死于V，前提应该是 M只用来被治V，这个是对的，我也可以理解的，但是B中的有些人不ingest M这个怎么说啊？既然文中已经提到了说M是被经常用来治V的，那么，肯定有人不喝不就包含在了这句话里了？怎么可能会人人都喝呢？再者，即便人人都喝M，那么也可能是人人都得了V这种病，那跟B死于V还是没关系吧？这个逻辑链怎么推的，我怎么想不通呢？就像楼上举得例子，板蓝根经常用来治疗感冒，那么就暗示了感冒的人会经常喝板蓝根，怎么会跟人人都会喝板蓝根扯上关系的？求解，多谢

sdcar2010 · 发表于 2011-4-18 21:09:42

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.

This is an old LSAT question. For the second hypothesis, if EVERYONE in Beethoven's time ate mercury as a daily supplement, then simply based on the fact that mercury is found in Beethoven's hair, we cannot conclusively say he ate the mercury to cure his disease because he might very well ate mercury as a daily supplement. Therefore we have to have the second assumption for the arugment to hold.

sdcar2010 · 发表于 2011-4-18 21:10:10

Use the negation method on B. If NOT some people in Beethoven’s time did not ingest mercury, then it is not possible to prove the Beethoven ingested mercury to cure his disease. Then the whole argument falls apart.

mlvince · 发表于 2011-4-18 21:20:13

B 取非吧，就是no people in Beethoven’s time did not ingest mercury. =every people in Beethoven’s time ingested mercury.这样的话推理就不能成立了

狒狒逻辑蒙了 21题

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狒狒逻辑 蒙了 21题

所属分类: GMAT考试

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狒狒逻辑蒙了 21题