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.
（anti——h）导致k，即 （抗体 对 h 作用） ，才能得到 k
也就是说，要想得到k，anti 和 h 两者缺一不可~
而这道题问的是：找出另一个解释，来支持这个hypothesis~
那来看D:There are mice that are unable to form antibodies in response to herpes infections
前半句的意思就是：有k，没有 anti
and these mice survive these infections without ever developing keratitis.
后半句的意思是：得不到k
小菜以为，这种说法就符合了我刚才说的： 要想得到k，anti 和 h 两者缺一不可~
所以小菜选D~
按我的思路咱们再看C，大意就是：有h，没有k，老鼠还产生出和....一样多的anti~那这不就anti和h都有了，那k不就应该有了吗？所以C自然是错的~
D) is the answer. Very simple correlation and causation type of question. A --> B. No A--> No B is a strengthener.作者: Netherlanders 时间: 2012-5-12 09:03
On the right track but you added an extra assumption (antibody works against herpes virus). A better way is to say: the antibody binds to the protein target (premise).
The conclusion of the argument is:
antibody causes the K disease.
The strengthener says:
Without the antibody, there is no K disease
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