狒狒24题，欢迎大家指点

cynthia129

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.
正确答案是E，小女选的A。
我个人理解，文中结论:male cats 之所以得这种病，和the size of the interstitial nucleus有关。 条件：male cats had interstitial nuclei that were as large as those generally found in female cats. 我选的是A，理由：因为female cats 的sizeof the interstitial nucleus 和得病的male  cats的 size差不多大，如果female cat 并没有得这种病，那么说明跟size 无关。。狒狒对A的解释是：讨论female cat 是irrelevant, 那文中引入female cat 的用意是什么？都是cat, 为什么会无关？？