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
The multi-tube boiler system made the Rocket, Robert’s locomotive, ______.
A．powerful
B．achieve a speed of 30 miles an hour
C．acquire 25 little tubes
D．good for hauling trains
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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