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Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16.
What is the main topic of the lecture

A．Bicycles and cars.
B．Building codes.
C．Energy conservation.
D．New housing construction.

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Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16. What is the main topic of the lecture 您的浏览器不支持 audio 元素。