单项选择题

Circus tigers, although they have been tamed, can ________ attack their trainer.

A．unexpectedly
B．deliberately
C．reluctantly
D．subsequently
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单项选择题
Although there are occasional outbreaks of gunfire, we can report that the rebellion has in the main been ________.
A．canceled
B．destroyed
C．suppressed
D．restrained
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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