单项选择题

It can be inferred from the passage that the author's opinion of nowadays' human beings is ______.

A．not very high
B．high
C．contemptuous
D．critical
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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
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
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