单项选择题

A fundamental premise of a free-enterprise economic system is that all small businesses face difficult competition.

A．confront
B．mock
C．lose
D．appreciate
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单项选择题
The United States is trying to deal with the serious problems brought on by the energy crisis.
A．dispense
B．cope
C．cooperate
D．interact
单项选择题
Throughout most of their lives,human beings perpetually learn and increase their mental capacities.
A．actually
B．readily
C．finally
D．constantly
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