单项选择题

It is hard for the young people to imagine what severe conditions their parents once lived under.

A. sincere
B. hard
C. strict
D. tight
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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
Successful leaders dominate events rather than react to them.
A. control
B. contribute
C. convey
D. contact
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