The message the author transmits to us by the lie detector is that _____________

A．it is vital for us to be truthful to each other

B．lying will be checked by more advanced lie detectors

C．a lie detector can make a good record of nerve impulses

D．a liar benefits himself from lying, but only at the cost of others

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【设题处】观点处设题
【解析】选A。从通篇结构上来看，第六、七段对三、四、五段有关测谎器的内容进行了概括总结。作者得出的结论即想传达的信息是“…we are biologically designed to be truthful to each other”，A与此相符合，故为答案。B和C不是文章主要表达的内容；D中的benefits明显错误。

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