单项选择题

Some minerals are quite common, others are regionally ______, and still others are rare on the earth.

A．attributed
B．distributed
C．contributed
D．scattered
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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
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
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