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 ease
B、at random
C、in essence
D、in sum

答案B

解析本题的考点是固定词组的上下文辨析。at random意为“胡乱地，随便地”；根据上下文，选项B为正确答案。

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