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【题目】Lack of sleep _______ lead to weakened immunity and memory, and also slow physical growth.

A. shallB. mustC. shouldD. can

【答案】D

【解析】

考查情态动词辨析。句意:睡眠不足会导致免疫力和记忆力下降,还会减缓身体发育。A. shall将;B. must必须;C. should应该;D. can会,表示理论上或是逻辑判断上,用can,故选D

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