单项选择题

When the wires fell, they________ the gas leaking from the main.

A．ignited
B．inspired
C．excited
D．illuminated
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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
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
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