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  3. Most of us are neither pilots nor astronauts. We are not trained to steer large hulks of steel and gasoline while manipulating s

Most of us are neither pilots nor astronauts. We are not trained to steer large hulks of steel and gasoline while manipulating s

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问题     Most of us are neither pilots nor astronauts. We are not trained to steer large hulks of steel and gasoline while manipulating small computers. So there’s something blindingly obvious about the risks of texting while driving. Yet research is beginning to show that driving while simply talking on a cell phone — including using hands-free technology — can prove dangerous, even deadly.
    In late July, the Center for Auto Safety released hundreds of pages of a study that identified the cell phone as a serious safety hazard when used on the road. And though it’s impossible to accurately calculate how many car accidents nationwide are cell phone related, David Strayer, a psychology professor at the University of Utah, estimates that only 2% of people are able to safely multitask while driving.
    Strayer, who for more than a decade has been studying the effects driving and cell-phone use have on the brain, says those 2% are probably the same people who would be really good fighter pilots. Rarities. Some of Strayer’s other findings show that most drivers tend to stare straight ahead while using a cell phone and are less influenced by peripheral vision. In other words, "cell phones," he says, "make you blind to your own bad driving."
    And even though the common assumption is that hands-free technology has reduced the more dangerous side effects of cell-phone use, a series of tests conducted by Strayer seems to indicate the opposite. A passenger acted as another set of eyes for the driver in the test and even stopped or started talking depending on the difficulty of conditions outside the car. Meanwhile, half the drivers talking on a hands-free phone failed, bypassing the rest area the test had called for them to stop at.
    Part of the problem may be that when people direct their attention to sound, the visual capacity of their brain decreases, says Steven Yantis, a professor of psychological and brain sciences at Johns Hopkins University. It can be as if a driver is seeing the image in her head of the person she is talking to, thereby decreasing her ability to see what’s actually in front of her.
The passage is intended for emphasizing the safety issue on______.
选项 A、working on computers
B、traveling in space
C、using a cell phone
D、driving a car
答案D
解析 主旨大意题。文章第一段即点明主旨：研究显示边开车边使用手机通话，即使使用了免提技术也是危险的，甚至是致命的。由此可知本文意在强调开车的安全问题，故答案为[D]项。第一段前两句说我们大部分人都不是飞行员或宇航员，不能边操作电脑边驾驶飞机或飞船，指的是我们大部分人都不能多任务操作，[A]项和[B]项是利用这两句设置的无关干扰，故排除；本文主要是讲使用手机影响开车安全，所以主题是开车的安全问题，而不是使用手机的安全问题，故排除[C]项。
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