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
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
In writing this letter the author is ______.
A．disagreeing with a proposal
B．criticizing a proposal
C．supporting a proposal
D．putting forward a proposal
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