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Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20 What is the main topic of the lecture

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

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20 What is the main topic of the lecture 您的浏览器不支持 audio 元素。