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【单选题】
色氨酸操纵子调节中,色氨酸是作为A.
衰减子
B.
活化物
C.
辅阻遏物
D.
操纵元件
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【单选题】听力原文：M: Can I help you? W: Yes, I'm looking for the cashier's． Q: What is the woman going to do? (24)
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