单选题
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Some studies suggest that straight, horizontal bars painted a cross roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bars Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.
The advantage of chevrons over straight, horizontal bars is that the former ________.
问题1选项
A.can keep drivers awake
B.can cut road accidents in half
C.will have a longer effect on drivers
D.will look more attractive
A.can keep drivers awake
B.can cut road accidents in half
C.will have a longer effect on drivers
D.will look more attractive
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