单项选择题

We're expanding rapidly, and it's________ that we function with more efficiency.

A．imperative
B．tentative
C．alternative
D．prospective
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单项选择题
The country's economic future is seriously________ by the mass immigration of young people.
A．tumbled
B．jeopardized
C．crumbled
D．hindered
单项选择题
An area several times as large is suffering a decline in productivity as it is________ by overuse.
A．depressed
B．defaulted
C．deteriorated
D．degraded
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