The specimens to be analyzed were taken _______.A、by accidentB、at randomC、on o

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问题 The specimens to be analyzed were taken _______.

选项 A、by accident
B、at random
C、on occasion
D、on average

答案 B

解析介词短语辨析。A．by accident偶然地，碰巧地；B．at random随机地，任意地；C．on occasion有时，必要时；D．on average平均，通常。根据句意应选B。句意为：要进行分析的样品是随机抽取的。

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