单项选择题

Forests can provide beauty and prevent ______ . Therefore, we should spare no efforts to protect forests.

A．erosion
B．corruption
C．decay
D．spoil
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单项选择题
He failed to carry out some of the provisions of the contract, and now he has to ______ the consequences.
A．answer for
B．run into
C．abide by
D．step into
单项选择题
He failed his exam ,and it ______ him right because he had not studied for the whole semester.
A．served
B．taught
C．gave
D．showed
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