[讨论]如何看待prep

听朋友说prep的材料是真题，故拿来一做，但发觉prep的题目相当不严谨，这边我先抛砖引玉，希望大家把prep上发现的问题一同讨论，以便更深刻的理解各语法点。

prep2－34

34.   (26262-!-item-!-188;#058&003094)

Besides adding complementary flavors to many foods, hot sauces stimulate the release of endorphins in the brain, just as exercise does, and these have a pain-relieving effect like morphine's.

(A) hot sauces stimulate the release of endorphins in the brain, just as exercise does, and these have a pain-relieving effect like morphine's

(B) hot sauces stimulate the release of endorphins in the brain, like exercise, and they have a pain-relieving effect that is like morphine

(C) hot sauces and exercise both stimulate the release of endorphins in the brain, and they have a pain-relieving effect like morphine

(D) the release of endorphins in the brain is stimulated both by hot sauces and exercise, and they have a pain-relieving effect like morphine's

(E) the release of endorphins in the brain is stimulated by hot sauces, just as with exercise, and these have a pain-relieving effect like that of morphine

答案：A 。如果利用5选2原则的话，我相信绝大部分都会在A、B里面最终确定答案。那我先来分析一下答案

A，明显错误在于后半句的these，单独使用these指代前面出现的hot sauces，此类用法在GMAT中绝对需要杜绝。但此处居然算对，不知道是什么意思？

B，明显错误在于后半句的不对等比较（effect与morphine比较）。

C，D,  E 明显错误在于主句逻辑主语不能与Besides adding complementary flavors to many foods相配

不知道各位碰到此类题，会选哪个答案？

呵呵，不知道你在看哪些材料啊，能否分享一下。目前多见的就是OG，大全（白勇包括在大全中），其他的好像没有了。

These are his grandparents. That’s his father. That’s his mother. That’s his sister.

为什么不能作主语呀？