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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单项选择题
This teaching method is a ______ of many methods which have been used for decades in the country.
A．symposium
B．symphony
C．spectrogram
D．synthesis
单项选择题
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
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