单项选择题

What does the passage say about asteroids and meteoroids（）

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

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单项选择题

We can conclude from the passage that （）

A．asteroids racing across the night sky are likely to hit Earth in the near future
B．workable solutions still have to be found to prevent a violent coming course of aster olds with the earth
C．the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D．while pushing asteroids off course nuclear weapons would destroy the world

单项选择题

What do people think of the suggestion of using nuclear weapon to change the course of asteroids（）

A．It sounds practical but it may not solve the problem.
B．Further research should be done before it is proved to be capable.
C．It may create more problems than it might solve.
D．It is a waste of money because a violent coming course of asteroids with the earth is very. unlikely.