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
Satellite communications are so up-to-date that even when（）in the middle of the Pacific, businessmen can contact their offices as if they were next door.

A. gliding
B. cruising
C. piloting
D. patrolling
单项选择题
（34）（）

A. act
B. demonstrate
C. behave
D. perform
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