单项选择题

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

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.

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填空题

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。