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Questions 19 to 22 are based on the conversation you have just heard.

A．An alien spacecraft landing.
B．The impact of a meteorite.
C．A volcanic eruption.
D．The blizzard conditions in Alaska.

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1. 举例说明水对人类的重要性2. 举例说明我国所面临的水资源问题3. 为了生存和发展人们要……Precious Water

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