When a psychologist does a general experiment about the human mind, he selects p

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问题 When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.

选项 A、at random
B、at will
C、at length
D、in essence

答案 A

解析短语词义辨析题。根据句意，at random“随机地，随便地”，符合题意；at length意思是“最终，最后；详尽地”；in essence表示“本质上”；at will意思是“随心所欲”。

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