单项选择题

He could not （）ignorance as his excuse; he should have known what was happening in his department.

A．petition
B．plead
C．resort
D．reproach

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单项选择题
Any salesperson who sells more than the weekly （）will receive a bonus.

A．ratio
B．quota
C．allocation
D．portion
单项选择题
Many ecologists believe that lots of major species in the world are on the （）of extinction.

A．margin
B．border
C．verge
D．fringe
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