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
We were astonished to hear that their football team had won the champion.
A．amazed
B．amounted
C．amused
D．approached
单项选择题
He possesses a remarkable gift for music.
A．ability
B．capacity
C．talent
D．competence
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