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题目材料：

A mouse's immune system generally rejects proteins different from those produced by that mouse. The immune system of a pregnant mouse does not, however, reject the mouse's fetuses, although the fetal tissue a fetus produces as it develops typically contains many such proteins. Some scientists hypothesize that the placenta surrounding the fetus physically blocks the mother's immune system. But others, noting that the placenta produces IDO, an enzyme that suppresses the immune system, hypothesize that IDO plays a crucial role in protecting the fetus.

第1题

In order to choose between the two hypotheses, it would be most useful to determine which of the following?

A.Whether mice sometimes produce IDO when they are not pregnant
B.Whether the immune systems of fetal mice are capable of attacking the tissue of the mother
C.Whether there are cases in which the immune system of a pregnant mouse rejects some fetuses but not others
D.Whether IDO is the only substance capable of suppressing the immune system produced by mice
E. Whether the immune systems of pregnant mice that are given a drug that inhibits IDO production subsequently reject the fetus.

E显示答案

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以上解析由考满分老师提供。

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