单项选择题

A．For boat racing.
B．For renting.
C．For speed competition.
D．For the season.
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单项选择题
A．7 hours.B．8 hours.C．9 hours.D．14 hours.
A．7 hours.
B．8 hours.
C．9 hours.
D．14 hours.
填空题
According to the author, except global warming and privatization of water,______is also responsible for fresh water shortage.
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