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A．Most of us should take more exercise.
B．It’’s better to live in the town.
C．The brain contracts if it is not used.
D．The more one uses his brain, the sooner he becomes old.
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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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