单项选择题

A．An alien spacecraft landing.B．The impact of a meteori……

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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单项选择题A．Mary is worthy of the prize.B．Mary has granted the prize.C．Mary fails in the speech contest.D．The man doesn’t think Mary deserves the prize.

问答题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．为了自下而上和发展人们要……Precious Water