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
According to the report, the contest will last ______ days.
A．one
B．two
C．four
D．six
单项选择题
The Leatherstocking Tales, which included The Pioneers, The Last of the Mohicans, The Prairie, The Pathfinder and the Deerslayer, were written by ______.
A．Washington Irving
B．Edgar Ellan Poe
C．James Cooper
D．William Bryant
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