lsat版面里太冷清了，一下午就欧一个人，没有人给偶解这个题，在偶被这道题搞疯之前，贴到这里来试试，斑竹不要怪偶啊！
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.
E选项的意思是hpothalamus与x无关，削弱原文从hypothalamus的大小来判断是否的了x。
但是原文并没有提到专家检查了多少只猫才发现得过x，hypothalamus就大，那我们是不是可以认为这种联系是没有例外的？那这样E选项否定了这个前提？削弱可以否定前提吗？
看一下D。1000只没有病的猫，5只猫的hypothalamus比正常的大，因为1000在概率论里足以构成一个大样本，所以可推出：在没有得病的猫里，hypothalamus大的概率在0.5%，说明即使没得病，也有0.5%左右的猫会有大的hypothalamus，而原题目中说得x病的概率低于0.05%。前者的概率是后者的10倍左右。这是不是削弱？
我做这道题时答案选的是D。
啊？是D吗？
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.
我下的费费宝典里的答案就是这么给的啊！是2004-6-29版的
D的样本1000不足以从数量上说明(文中没有说1000作为样本有代表性),不能weaken.
E从根本上否定 X 是病因(根本不提尺寸大小).---- 对hypothalamus的定义: (The interstitial nucleus, a sub-region of the brain’s hypothalamus )/ 在E中对X的定义:disease X is a subtype of disease Y. 再看看E--The hypothalamus is known not to be causally linked to disease Y,
楼上说的有道理。
这道题结论“the size of the interstitial nucleus determines whether or not male cats can contract disease X”的实质是说“the size of interstitial nucleus”和disease Ｘ有因果联系，而Ｅ则通过Ｙ（Ｘ属于Ｙ）来反驳这种因果联系。
还是想选D
D选项说没得病的老鼠中也有．．比较大的，所以．．比较大不能决定是否得病，这不就是削弱了吗？
E选项中x和y的关系并不明确啊
我觉得D.E都对,可是D从根本上削弱了,相对好一些
这题在我还没正确答案之前我就肯定会把D排除掉
首先，在这种题里面，除非题目中有严格的数据参照，选项中出现的数据才值得一看，否则出现数据比较肯定是直接砍掉的。
其次，概率的意义相信大家都清楚，比如说骨髓移植的某概率是5%，而直系亲属之间的概率是30%，数据纯粹是我假设的，那是不是说找4个直系亲属就可以保证一定可以骨髓移植呢？当然不是！概率的含义不能这样理解的，没有绝对数值大小之间的比较的，不能像楼主这样比较。
最后关于样本大小的问题，这个是很常见的。100个样本和1000个样本，即使是10000个或者是1000000个样本都不能准确的概括总体的实际情况
d is not correct, because "5 revealed interstitial nuclei" are just "larger than those of the average male cat", not "as larger as those of female cats". so there is no relationship between D and the question.
up
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