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
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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
单项选择题
At first, locomotives could not popularize themselves because they ______.
A．could not bring profits or save much labor
B．attract people
C．only caught some people's interest
D．were not welcome
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