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

答案是A

白勇的语法书里面明确提到these/this等不能作为句子主语，而且以前也有不少这样的错误例子（多为this不能作为主语），这里为什么these可以作为主语了，有些疑惑，虽然A是错的最少的一个选项。

(B) hot sauces stimulate the release of endorphins in the brain, like

exercise, and they have a
pain-relieving effect that is like morphine

Like比较结构置于句中，比较对象有歧义

我怎摸不觉得这个ＬＩＫＥ有歧义，ＬＩＫＥ后面有ＡＮＤ，明显是跟前面的比较呀

？难道能跨过ＡＮＤ比较吗？？？