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. 这题我这么理解的不知道对不对,interstitial nucleus一般是male小于female,然后发现0.5%的(这数据没错吧?原题打错了?)有X病的male的interstitial nucleus跟female的一样,于是说是interstitial nucleus的大小决定了male的生病 那D说没有X病的male中0.5%的interstitial nucleus比一般male大,(也就是有可能和female一样),也就是说0.5%的比例是正常的,不能说明是病因,这样不就weaken了吗?请问我的错误在哪里呢?
[此贴子已经被作者于2009/8/17 22:38:16编辑过] |