单项选择题

If the fire alarm is sounded, all residents are requested to ________ in the courtyard.

A．assemble
B．coverage
C．crowd
D．accumulate
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单项选择题
To ________ is to save and protect, to leave what we ourselves enjoy in such good condition thltt others may also share the enjoyment.
A．conserve
B．distort
C．distract
D．contrive
单项选择题
The economic crises in that country have threatened the ________ of the government.
A．stability
B．capability
C．persistence
D．permanence
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