单项选择题

Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16.
Why is insulation required in new houses

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

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Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16. Why is insulation required in new houses 您的浏览器不支持 audio 元素。