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

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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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