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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.
【C1】
选项 A、start over
B、start for
C、start off
D、come off
答案C
解析 后半句表转折的but表明，teen drivers往往会在几个月后(after just a few months)就开始边开车边做其他事情(start multitasking)，这与being careful完全不同。由此判断，being careful是青少年刚开始开车时的表现，故选C项start off“开始”。A项start over表示“重新开始”，而上下文并未体现出“重新”的含义。B项start for一般后接地点。表示“动身前往……”。D项come off表示“举行，表现，完成”，不能与being careful构成合理的动宾关系。
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