单项选择题

During the past ten years there have been dramatic changes in the international situation.

A．permanent
B．powerful
C．striking
D．practical.
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单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.
A．puzzling
B．difficult
C．terrifying
D．urgent
单项选择题
It's prudent to take a thick coat in cold weather when you go out.
A．controversial
B．reasonable
C．sensible
D．sensitive
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