单项选择题

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

A．Fellow teachers.
B．Freshmen of a university.
C．Second-year students.
D．Either seniors or juniors.

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The purpose of improving the education quality is to create an environment in which people may achieve further success.

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