多肽链的基本化学键是什么？蛋白质分子中有那些重要化学键？它们有何功能。
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2. The doctors think that the new course of treatment will do _______ for him.
3. Before falling asleep, she reviewed the day’s ________________.
4. What are your ________________ in food?
5. You should tell your parents about your unusual ____________ in Africa.
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