单项选择题

Strict sanitary procedures formulated by our municipal government help to ______ out breaks of diseases.

A．preview
B．forestall
C．ignite
D．fluctuate
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People of all countries are expected to ______ the principles of the United Nations and defend the peace in the world.
A．inspect
B．expedited
C．uphold
D．reinstall
单项选择题
They are taught by their superiors that a soldier who ______ his post in time of war is to be shot.
A．deserts
B．deflects
C．detains
D．threw
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