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
What do scientists say about the violent coming course of an asteroid with the earth（）

A．Violent coming courses of smaller asteroids with earth take place often than expected.
B．It's still too early to say whether such a violent coming course might happen.
C．Such a violent coming course might happen once every 25 years.
D．It is very unlikely but the danger exists.
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.
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