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

答案B

解析 本题考查介词短语。at random意为“随机地,任意地,随意地”,符合语义,故为答案。at length意为“详细地;最终,终于”。in essence意为“本质上,实质上,基本上”。in bulk意为“大量,大批”。
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