求助 GWD-13-Q40:

ldeath

In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface.  Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye.  Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.

Which of the following, if true, gives the greatest additional support to the scientists’ hypothesis?

A. Other types of virus have surface proteins that closely resemble proteins found in various organs of mice.
B. There are mice that are unable to form antibodies in response to herpes infections, and these mice contract herpes at roughly the same rate as other mice.
C. Mice that are infected with a herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis.
D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis.
E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis.
先说一下我的理解：
premise A:Mice infected with a herpesvirus generally develop keratitispremise B: Mice infected herpesvirus produce antibodies

Conclusion: keratitis are caused by antibodies to herpesvirus

我选了C，
C中的逻辑：Mice infected herpesvirus which don't get keratitis, But it still produce antibodies.
我认为既然不是K导致了A，
根据前提，A和K有关系
那么就是A导致了K
因此强化了论述

和下贴的逻辑类似
http://forum.chasedream.com/thread-836385-1-1.html

请教一下这道题正确的逻辑思路。多谢

ldeath

顶上来一下……

陶德gmat

我觉得是D啊 文中conclusion是 A 导致K   ，  D选项中说 没有产生A 的 mice 也没有产生K 不就加强conclusion么。

C选项说  不管产不产生K 总有 A存在  不是削弱了 A 导致K 吗？ 因为按conclusion 只要有A 就会产生K啊。

理解一下~

陶德gmat

话说答案是哪个啊？？？

zxppx

文中的结论是K是由于针对H的抗体引发的，要加强结论。C选项：发展成为K的老鼠和没发展成为K的老鼠是否产生同样多的抗体，并不能说明K是由什么引起的。D选项：不能形成抗体来对抗感染了H的老鼠没有发展成为K，从反方面来说明“缺乏针对H的抗体，就不能形成K”，所以加强结论。

陶德gmat

我发现我错了……   D 选项 是逆命题  不一定对 （cr中专门迷惑选项，绝大多数是情况是错的，中招N次  还有否命题也是一样）
C是对的  逻辑如楼主

陶德gmat

lss 我纠结了！！！！！！！！

ldeath

这道题目答案是D，我之前也是纠结于C，D之间
我就是想看一下D的逻辑链应该是怎么样的……