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
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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
单项选择题
The firm ______ in producing cheap transistor radios.
A．exerts
B．excels
C．energizes
D．exploits
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