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
His health had deteriorated while he was in prison.
A．became better
B．became worse
C．became stronger
D．became weaker
单项选择题
The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．continuously
B．quickly
C．excessively
D．exceptionally
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