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
Visitors to Britain are sometimes surprised to learn that newspapers there have such a large ______.
A．issue
B．distribution
C．coverage
D．circulation
单项选择题
For 14 years after her spouse's death, she saw the ______ meaning of her life as nourishing her son and safeguarding her husband's works.
A．due
B．lone
C．sole
D．keen
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