单项选择题

Methanol-fueled vehicles would __ an immediate lessening of urban air pollution.

A．attribute to
B．attend to
C．contribute to
D．devote to
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单项选择题
The artist __ his trip to Paris because he was ill.
A．called off
B．closed down
C．put up
D．went off
单项选择题
Many Chinese restaurants pride themselves __ their cooking and service.
A．with
B．about
C．on
D．of
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