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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According to the report, the contest will last ______ days.
A．one
B．two
C．four
D．six
单项选择题
Mike began to play baseball at ______.
A．24
B．27
C．18
D．20
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