单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．In warm air.
B．In cold air
C．When it reaches the polar region.
D．Only when the clouds are down low.

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单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。