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【题目】When I put a finger to my lips, it’s a _____ for you to be quiet.

A.signalB.missionC.contractD.demand

【答案】A

【解析】

考查名词辨析。句意:当我把手指放在嘴唇上时,这是一个让你安静的信号。A. signal信号;B. mission任务;C. contract合同;D. demand命令。结合句意可知选A

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