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

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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

单项选择题

He bought his house on the （）plan, paying a certain amount of money each month.

A．division
B．premium
C．installment
D．fluctuation

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