Macrophages are cells that play a role in the response of the immune system of mice and other mammal...

题目信息

Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.

The statements above, if true, provide the most support for which of the following conclusions?

A:Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.

B:Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.

C:In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.

D:When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse's body decreases.

E:Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals' immune systems to fight off infection.

参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等；如有疑问，欢迎在评论区提问与讨论

正确答案： C:In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.

题目说M是个细胞可以起作用在免疫系统，对应一些organisms的侵袭，比如细菌什么的，那么缺少M的老鼠是不会显现出N，当被细菌侵袭的时候。

A说缺少M的老鼠会用别的方法来保护自己免受细菌侵袭（这个我们是不能推出来的，因为原文没有说别的方法啊，不能主观）

B说显示出一定程度的N的老鼠可以轻松对抗大部分细菌侵袭（显然我们也没办法推，原文直说缺M的老鼠没有N，那么有N的老鼠我们不知道会是怎样啊~）

C说在老鼠里，M起到一个作用就是产生N 或者禁止一个程序通过N的减少啊~ （看起来还可以啊，至少一直再说M N 老鼠的事情，也没有扯到别的）

D说当一个健康的老鼠被侵袭，M会减少。（这个推不出啊，我们只知道它会起作用，你怎么知道会减少，而不是搞点别的花样来对抗？）

E说注射N到缺少M的老鼠体内不会增加它们的免疫能力

笔记