摘要：5．What the doctor warned us is that the sleep may cause anger.poor memory and poor concentration. A．want in B．plenty of C．lack in D．lack of 解析:选D.根据后面的“cause anger.poor memory and poor concentration 可知应是缺乏睡眠.故排除B项.want表示“缺乏 时.应和of搭配,lack作名词时不能和in搭配.

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