单项选择题

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

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A bird flu, a massive earthquake, a monster storm and a terrorist attack are all threats to major cities in the U.S.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。