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Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20 Why is insulation required in new houses

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

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单项选择题

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Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20 Why is insulation required in new houses 您的浏览器不支持 audio 元素。