单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．7 hours.
B．9 hours.
C．8 hours.
D．14 hours.
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According to the author, except global warming and privatization of water,______is also responsible for fresh water shortage.
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The Yellow River in China failed to reach the sea for the first time in history in the year of______.
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