单项选择题

Charles Goodyear's discovery of vulcanized rubber began when he inadvertently spilled a mixture of rubber and sulfur on a hot stove.

A．experimentally
B．unceasingly
C．incompetently
D．accidentally
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单项选择题
We entertained the guests with a detailed description of the party.
A．treated
B．amused
C．ensured
D．provided
单项选择题
He refused to accept the job for various reasons.
A．all kinds of
B．embarrassed
C．difficult
D．varied
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