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

          A. shallB. mustC. shouldD. can

          【答案】D

          【解析】

          考查情態(tài)動詞辨析。句意:睡眠不足會導(dǎo)致免疫力和記憶力下降,還會減緩身體發(fā)育。A. shall將;B. must必須;C. should應(yīng)該;D. can會,表示理論上或是邏輯判斷上,用can,故選D。

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