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Questions 17 to 20 are based on the following monologue about energy conservation. You now have 20 .seconds to read Questions 17 to 20. What is the purpose of building new houses facing north or south

A．To avoid direct sunlight.
B．To limit space used.
C．To keep out the cold.
D．To conform to other houses.

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Questions 17 to 20 are based on the following monologue about energy conservation. You now have 20 .seconds to read Questions 17 to 20. What is the purpose of building new houses facing north or south 您的浏览器不支持 audio 元素。