单项选择题

A．To get information.
B．To know the related areas.
C．To know the latest news.
D．To make friends.
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单项选择题
A．How did both the Constitution and democracy become so workable and sustainableB．How did both the Constitution and republic become so workable and sustainableC．How did the system of democracy become so workable and sustainableD．Not given.
A．How did both the Constitution and democracy become so workable and sustainable
B．How did both the Constitution and republic become so workable and sustainable
C．How did the system of democracy become so workable and sustainable
D．Not given.
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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