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Questions 14～17 are based on a radio program. You now have 20 seconds to read Questions 14～17. Why is insulation required in new houses

A．To limit heating bills.
B．To prevent heat loss.
C．To determine the temperature in homes.
D．To convert homes to electric heat.

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单项选择题

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Questions 14～17 are based on a radio program. You now have 20 seconds to read Questions 14～17. Why is insulation required in new houses 您的浏览器不支持 audio 元素。