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Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．To fly one following another.
B．To fly without stopping.
C．To use land features as the guide.
D．To take one route only.

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What is the meaning of alcohol-free ____________________________________

Passage Three Questions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。