单项选择题

What does the author say about straight, horizontal bars painted across roads

A．They are failing out of use in the United States.
B．They tend to be ignored by drivers in a short period of time.
C．They are applicable only on broad roads.
D．They cannot be applied successfully to traffic circles.

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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.

单项选择题

What does the passage say about asteroids and meteoroids

A．They are heavenly bodies different in composition.
B．They are heavenly bodies similar in nature.
C．There are more asteroids than meteoroids.
D．steroids are more mysterious than meteoroids.