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
There are two main requirements before the fifth-generation computer can become a reality and it is these that scientists are _________.
A．anticipating
B．tackling
C．manipulating
D．speculating
单项选择题
It was believed that his death _________ with the robbery of the bank downtown.
A．accompanied
B．coincided
C．correlated
D．conformed
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