单项选择题

There are new concerns about the ________________ of the U.S. economic expansion.

A．duration
B．momentum
C．prospect
D．future
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单项选择题
For a playoff player, the whole season lasts _____________ months.
A．6
B．8
C．10
D．11
单项选择题
Mike went to Mexico to play the winter season primarily because _________________.
A．it helped him earn extra money
B．his season was over
C．he needed more experience
D．he could improve his skills
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