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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单项选择题
You haven't really answered the question, for what you said is not _________.
A．eligible
B．pertinent
C．provocative
D．expeditious
单项选择题
New mineral resources may be discovered during the present Antarctic _________.
A．excursion
B．expedition
C．voyage
D．journey
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