单项选择题

The advantage of chevrons over straight, horizontal bars is that the former______ .

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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单项选择题
The passage mainly discusses______ .
A．a new way of highway speed control
B．a new pattern for painting highways
C．a new approach to training drivers
D．a new type of optical illusion
单项选择题
On roads painted with chevrons drivers tend to feel that______ .
A．they should avoid speed-related hazards
B．they are driving in the wrong lane
C．they should slow down their speed
D．they are approaching the speed limit
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