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Other _________ include quinine, which comes from _______________________, and drugs to reduce high _____________ are derived from ______________________________.
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A.
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B.
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A.
presentation n. 提交; 演出; 陈述，报告;
B.
complain vi. 抱怨，诉苦; 申诉，控诉，抗议;vt. 诉说，申诉，控告;
C.
expert n. 专家，能手; 权威; adj. 专家的;
D.
involve vt. 包含; 使参与，牵涉;
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