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【单选题】

When a psychologist does a general experiment about the human mind. he selects people ______ and asks them questions.
A．at length

B．at random
C．in essence
D．in bulk
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根据网考网移动考试中心的统计，该试题：

15%的考友选择了A选项

68%的考友选择了B选项

4%的考友选择了C选项

13%的考友选择了D选项

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