单项选择题

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

A．Seeing a falling round object.
B．Hearing a bird-like sound.
C．Observing a bright light.
D．Witnessing the impact.

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单项选择题

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The author does an assessment of all high-risk urban areas 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。