有的人白天工作效率高，有的人夜晚工作效率高，这是指：

有的人白天工作效率高，有的人夜晚工作效率高，这是指：

A.人的心理活动的周期节律性

B.环境适应力

C.心理自控能力

D.社交能力

正确答案：A

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