单项选择题

Passage Three
Questions 33 to 35 are based on the passage you have just heard.

A．In the lower atmosphere.
B．In the upper atmosphere.
C．On the Earth.
D．Near the Earth.

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单项选择题

单项选择题

Passage ThreeQuestions 33 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。