单项选择题

In the past 1500 years of development, the English language ______.

A．has been changing violently all the time
B．has been static all the time
C．has been changing slightly sometimes
D．has been static sometimes
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单项选择题
American scientists are very concerned about the ozone because ______.
A．the ozone is another form of oxygen
B．the ozone could keep us from the hurt from the sun's rays
C．the ozone is decreasing as a result of pollution
D．the ozone is very valuable in atmospheric research
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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