单项选择题

The unpleasant taste of the medicine _________ in his mouth for hours.

A．prolonged
B．retrieved
C．lingered
D．scattered
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单项选择题
The two countries should settle their disputes in a ________ manner.
A．rational
B．radiated
C．resolute
D．ratified
单项选择题
Finding the cause of SARS will provide a ________ for the research on a cure for it.
A．prospect
B．incentive
C．spur
D．inducement
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