In the US, psychologists at a number of universities are making a serious study of how rumors are born, how they ______ and how

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问题 In the US, psychologists at a number of universities are making a serious study of how rumors are born, how they ______ and how they can finally be killed off.

选项 A、congregate
B、segregate
C、aggregate
D、propagate

答案D

解析
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