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  3. Everyone knows that the first rule of driving is never taking your eyes off the road. Teen drivers【C1】________being careful, but

Everyone knows that the first rule of driving is never taking your eyes off the road. Teen drivers【C1】________being careful, but

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问题     Everyone knows that the first rule of driving is never taking your eyes off the road. Teen drivers【C1】________being careful, but they tend to start multitasking after just a few months behind the wheel, according to research published Tuesday. And【C2】________older drivers can handle eating or talking to passengers, which【C3】________up the new drivers, dialing a cell phone increased the risk of accidents among young and【C4】________drivers alike.
    This isn’t great news, since it’s well【C5】________that distracted driving is a leading cause of accidents among all drivers.
    It makes sense that young drivers will start testing their limits after a few months behind the wheel, according to Bruce Simons-Morton, a behavioral scientist. "You increase the difficulty of a task until you make an【C6】________," Simons-Morton says. "It seems like a very natural thing but still it’s very【C7】________, because good driving ability and safety judgment develops【C8】________a very long period of time."
    Within six months of getting their licenses, young drivers in this study -started texting, eating and【C9】________the radio while driving as much as their more skilled【C10】________. But it takes thousands of hours of【C11】________to get good at driving, according to Simons-Morton. That disconnect may help【C12】________the high accident rates among teenage drivers.
    The researchers compared data from two small studies—one tracked 42【C13】________licensed young drivers and the other looked at 100 drivers with more experience.
    All the participants had sensors and cameras【C14】________in  their  cars.  The  researchers  used  the  sensors  to track when  drivers  got into  accidents  or  close  calls. The videos  were  then  used to  see  what  the  drivers were doing just before the accidents【C15】________.
    Because  the  researchers  wanted  to  focus  on  the【C16】________of  distracted  driving,  they【C17】________crashes caused  by  drunk  driving  and  ones  that  were  clearly caused by other drivers.
    Since the number of people in this study was small, Simons-Morton says the results will have to be【C18】________by other research. A couple of bigger studies already【C19】________the works, might make things clearer. But Simons-Morton says this is the first totally【C20】________look at teen driver distraction.
【C2】
选项 A、because
B、if
C、unless
D、while
答案D
解析 第一个分句指出老司机开车时能吃东西、和乘客讲话，第二个分句指出拨电话号码却会增加司机出事故的风险。两个分句存在对比、转折关系的逻辑关系，答案只能选D项while“然而”。A项because“因为”，表因果关系。B项if“如果”，表假设。C项unless“除非”，相当于if…not。表示唯一条件。而本句强调对比，这三项均不符合语义逻辑。
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