The information given by the lie detector, according to the author, is ___________

A．trivial

B．essential

C．surprising

D．unreliable

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答案解析

【设题处】转折处设题
【解析】选B。由第三段中的…this may be the thing I've been looking for…(这正是我一直在找的)和末段首句的a petty thing to have this information…可知，作者认为测谎信息很重要(essential)，故B为答案。

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