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单项选择题
What do scientists say about the collision of an asteroid with Earth
A．It is very unlikely but the danger exists.
B．Such a collision might occur once every 25 years.
C．Collisions of smaller asteroids with Earth occur more often than expected.
D．It’’s still too early to say whether such a collision might occur.
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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