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
Successful leaders dominate events rather than react to them.
A. control
B. contribute
C. convey
D. contact
单项选择题
The example was fundamental to the argument.
A. impressive
B. public
C. essential
D. slight
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