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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.
- Ahot sauces stimulate the release of endorphins in the brain, just as exercise does, and these have a pain-relieving effect like morphine's
答案选A。 但是对these存在疑问,these指代endorphins 还是 hot sauces? 而且GMAT不是不喜欢用this, these 指代么? 而且还是不接修饰成分的this 和 these
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