单项选择题

Are you positive that there's been no mistake

A．rational
B．reasonable
C．certain
D．bound
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单项选择题
The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．continuously
B．quickly
C．excessively
D．exceptionally
单项选择题
During the past ten years there have been dramatic changes in the international situation.
A．permanent
B．powerful
C．striking
D．practical
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