单项选择题

After earthquake many local firms______ to disaster relief efforts.

A．administered
B．distributed
C．attributed
D．contributed
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单项选择题
We need things consumed, burned up, worn out, replaced and______ at an ever increasing rate.
A．canceled
B．dissipated
C．discarded
D．concealed
单项选择题
Consumer groups have complained that the existing two-company system has led to nearly ______prices and plans.
A．parallel
B．vertical
C．identical
D．specific
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