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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单项选择题

Which of the following can be best used as the title of the passage

A．Some Good News About the Ozone
B．The Montreal Protocol
C．The Ozone and CFC
D．CFC and Methyl Bromide