单项选择题

Questions 14～17 are based on a radio program. You now have 20 seconds to read Questions 14～17. What is the main topic of this talk

A．Bicyeles and Cars.
B．Building Codes.
C．Energy Conservation.
D．New Housing Construction.

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Which is NOT the purpose of the adult students taking part in adult programs

Questions 14～17 are based on a radio program. You now have 20 seconds to read Questions 14～17. What is the main topic of this talk 您的浏览器不支持 audio 元素。