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girlwithwings

24. The interstitial nucleus, a sub-region of the brain’s hypothalamus, is typically smaller for male cats than for female cats. A neurobiologist performed autopsies on male cats who died from disease X, a disease affecting no more than .05 percent of male cats, and found that these male cats had interstitial nuclei that were as large as those generally found in female cats. Thus, the size of the interstitial nucleus determines whether or not male cats can contract disease X.



Which one of the following statements, if true, most seriously weakens the argument?



A.       No female cats have been known to contract disease X, which is a subtype of disease Y.

B.        Many male cats that contract disease X also contract disease Z, the cause of which is unknown.

C.        the interstitial nuclei of female cats who contact disease X are larger than those of female cats who do not contract disease X.

D.       Of 1,000 autopsies on male cats that did not contract disease X, 5 revealed interstitial nuclei larger than those of the average male cat.

E.       The hypothalamus is known not to be causally linked to disease Y, and disease X is a subtype of disease Y.  



E is the best answer. Disease X is the subtype is disease Y, if disease Y has no link with hypothalamus, X must have no link with hypothalamus.  

 

A, C talked about the female cat, that can't weaken the argument.

B talked about another disease Z, doesn't weaken the argument.    

D just shows some data, which cannot weaken the argument.

我的理解是

Evidence 一般 公猫Size 比母猫小，

                       公猫Size大 是因为感染 X疾病

文中结论为 Size 可以决定是否 Contract disease X

要Weaken的话， Size 不能决定是否 感染X

D：理解为公猫Size有大的但无感染X

所以认为D 可以weaken 结论

这样的想法错在哪里呢？请帮我分析。多谢

（P.S. 我也觉得D,E选项都对）

croustillant

这题我也选D呢。。不过后来想通了

these male cats had interstitial nuclei that were as large as those generally found in female cats.所以说文章说公猫的size要和母猫的一样大，才算得X病。

D.       Of 1,000 autopsies on male cats that did not contract disease X, 5 revealed interstitial nuclei larger than those of the average male cat.
D选项只是说5个公猫的size比average大，但是没说和母猫一样大，所以5个不一定得X病。

estellegmat

croustillant 发表于 2009-12-19 18:20
这题我也选D呢。。不过后来想通了these male cats had interstitial nuclei that were as large as those g ...

懂了 这题真是太坑