According to the passage, if a driver falls asleep in one of the test cars, ______. The second paragraph talks most clearly abo

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问题 According to the passage, if a driver falls asleep in one of the test cars, ______.
The second paragraph talks most clearly about ______.

选项 A、the causes of fatal road accidents
B、the mechanism of the awake system
C、the ways to awake the dozing drivers
D、the schedule of developing the awake system

答案B

解析 第2段包含两个主要内容,第l句指出了研究唤醒系统的目的,第2句至末句介绍了该系统的运作机制,将四个选项与此对比,即可发现选项B为本题答案。第2段首句只提到了司机打瞌睡是一个引起致命车祸的原因,但没有详细论及其他原因,因此选项A不正确;选项C在第2段最后两句提及,但这是描述该系统的运作机制所涉及到的信息,因此选项C的概括性不如B强;原文只表明现在该系统正处在实验阶段,至于整个研制的计划安排并没有详细说明,因此选项D也不对。
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