单项选择题

To cope with pollution the author suggests ______.

A．wearing gas masks
B．encouraging the use of cars
C．encouraging the use of mass transportation
D．punishing the motorists
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单项选择题
The letters referred to in the first paragraph must have ______.
A．complained that carbon monoxide had affected their own ability to think
B．complained that carbon monoxide had affected other people's ability think
C．opposed the limiting of the use of cars
D．proposed the limiting of the use of cars
单项选择题
From the passage it can be assumed that wind energy is better because ______.
A．it is cheaper than electric power
B．it does not alter the environment as much as other types of power
C．it lasts longer than electric power
D．it is more efficient than electric power
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