单项选择题

Robert Frost-was an ______.

A．American novelist
B．English short - story writer
C．English essayist
D．American poet
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单项选择题
The best way to save ozone is ______.
A．that CFC manufacture is completely forbidden
B．that the production of CFC is reduced
C．to find substitutes for CFCs
D．to reduce the danger of CFCs
单项选择题
Why should governments ensure tire careful handling and recycling of the CFCs now in use
A．Because the CFCs directly damage the people's health.
B．Because the CFCs are poisonous chemicals.
C．Because the production of the CFCs costs a lot.
D．Because the CFCs can attack ozone by liberating atoms of chlorin
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