单项选择题

How many dangerous sports does the author mention in this passage

A．Three.
B．Five.
C．Six.
D．Seven.
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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
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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