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

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