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Questions 19 to 21 are based on the conversation you have just heard.

A．He uses it for his job.
B．He spends too much time on the bus.
C．He lives too far from the university.
D．He would feel safer at night with a car.

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Correspondence course was the major form of distance education in the past with the teaching being fulfilled through mail.

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。