单项选择题

A．7 hours.
B．8 hours.
C．9 hours.
D．14 hours.
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填空题
According to the author, except global warming and privatization of water,______is also responsible for fresh water shortage.
单项选择题
A．Confidants.B．Siblings.C．Business partners.D．Former classmates.
A．Confidants.
B．Siblings.
C．Business partners.
D．Former classmates.
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