单项选择题

I don' t really know John all that well; he' s just a ______ acquaintance.

A．random
B．formal
C．casual
D．haphazard
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单项选择题
Bill is an example of a severely disabled person who has become ______ at many survival skills.
A．proficient
B．persistent
C．consistent
D．sufficient
单项选择题
Prof. Smith spoke clearly and ______ and we could understand every word he said.
A．distinctly
B．distressfully
C．distractingly
D．distinctively
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