2. 外语
  3. Sleep laboratories around the world are finding that an alarming number of drivers on motorways may be failing【S1】______at the w

Sleep laboratories around the world are finding that an alarming number of drivers on motorways may be failing【S1】______at the w

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问题     Sleep laboratories around the world are finding that an alarming number of drivers on motorways may be failing【S1】______at the wheel. Although researchers have difficulty in knowing for certain【S2】______an accident has been caused by sleepiness, it appears that a driver who is on the road between 4 am and 6 am is about 10 times as【S3】______to have a sleep-related accident as someone who is driving in the middle of the morning or early in the evening. Some British police forces have become sufficiently【S4】______to  launch campaigns to alert the public to the danger. Leicestershire police,【S5】______, consider sleepiness to  be the cause of 20 percent of accidents on motorways and in the summer of 1990 ran a campaign with  the slogan "Stay awake, Stay【S6】______". Major motor manufacturers such as Ford and Renault are【S7】______ways of incorporating sleepiness detectors and alarms into their vehicles.
    If an accident involves only one vehicle, which runs【S8】______the road into the certain crash barrier, the embankment, a tree or a bridge, then sleepiness is likely to be the cause, especially if there are no skid marks or other signs of braking. A driver who is alert to an【S9】______crash grips the steering wheel and suffers different injuries from someone who is asleep and holding the steering wheel loosely.
    This pattern of injury, combined with an absence of skid marks on the road, also where that the driver was asleep in accidents well-spaced one vehicle runs into the back of another, especially if it occurs where traffic is light and vehicles are consequently【S10】______on the road. Under these conditions, the driver’s "inattention" must have been more than just momentary.

A．import        B．impending         C．alive        D．property
D．concerned     F．occur             G．asleep       H．portable
I．whether       J．investigating     K．off          L．likely
M．leap          N．for example       O．well-spaced
【S2】
选项
答案whether
解析 根据for certain的提示，选whether。
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大学英语四级

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