单项选择题

The explosion in the mine was ______ by a careless miner who lit a match.

A．triggered
B．claimed
C．hampered
D．protested
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单项选择题
The three astronauts have splashed down in the Pacific Ocean, only six miles from the aircraft carrier that was ______ for the recovery mission.
A．dispatched
B．deposited
C．deployed
D．delivered
单项选择题
This line was carrying equal number of eastbound and westbound trains, and they ______ regularly.
A．altered
B．alternated
C．switched
D．exchanged
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