单项选择题

The Montreal Protocol, an international treaty, is aimed at ______.

A．restricting uses of CFC
B．restricting uses of methyl bromide
C．banning uses of CFC
D．restoring the ozone in the atmosphere
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单项选择题
Which of the following can be seen as the effect of the Montreal Protocol
A．Increase of CFC pollution.
B．Ozone improvement in the upper stratosphere.
C．Ozone improvement in the lower stratosphere.
D．Increase of bromine gas levels in the atmosphere.
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