Besides adding complementary flavors to many foods, hot sauces stimulate the release of endorphrins in the brain, just as exercise does, and these have a pain relieving effect like morphine’s.
ＰＲＥＰ语法笔记里说：代词this, that, these, those不能单独用作主语，而且选项解释成these在此处指代前边出现的endorphrins，为什么此处的these就单独当了主语了呢？
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