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
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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
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 applicabl
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