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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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
单项选择题
（）efforts are needed in order to finish important but unpleasant tasks.

A．Consecutive
B．Condensed
C．Perpetual
D．Persistent
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