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
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单项选择题
It is out of the question that the inspector will come tomorrow.
A. impossible
B. possible
C. probable
D. likely
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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