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
What do people think of the suggestion of using nuclear weapons to alter the course of asteroids
A．It sounds practical but it may not solve the problem.
B．It may create more problems than it might solve.
C．It is a waste of money because a collision of asteroids with Earth is very unlikely.
D．Further research should be done before it is proved applicable.
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