单项选择题

All individuals are required to（）to the laws made by their governments.

A. obey
B. conform
C. concede
D. observe

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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

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

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