单项选择题

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

A．To keep the heat inside.
B．To prevent insects from escaping.
C．To reduce the risk of fire.
D．To keep the wood dry.

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单项选择题

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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。