单项选择题

The main point of the passage is ______.

A．a new way of highway speed control
B．a new approach to training drivers
C．a new pattern for painting highways
D．a new type of optical illusion
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单项选择题
On roads painted with chevrons, drivers tend to feel that ______.
A．they are driving in the wrong lane
B．they should avoid speed - related hazards
C．they should slow down their speed
D．they are approaching eh speed limit
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 completely
C．will have a longer effect on drivers
D．will look more attractive
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