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

According to the study led by Mr. Newchurch, which of the following statements is TRUE

A．The ozone layer was increasing by 8 percent every 10 years since the late 1970s.
B．In the past few years, the decrease rate of the ozone has been steady.
C．The atmosphere is beginning to gain ozone now.
D．We'll have a full recovery of ozone in 50 years if the Montreal Protocol is well observed.

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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