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 length
B、at random
C、in essence
D、in bulk

答案 B

解析 at random随意地；at length冗长地，详细地；in essence在本质上，实质上；in bulk整批地，大量地。句意：当一位心理学家要做关于人类思维的全面实验时，他就要随机选人并问他们问题。

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