单项选择题

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

A．He is an expert of car sales.
B．He is a mechanic of cars.
C．He is the owner of the ear.
D．He is an inspector.
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单项选择题
A．They award their own degrees.B．They select their own students.C．They set their own exams.D．They organize their own laboratory work.
A．They award their own degrees.
B．They select their own students.
C．They set their own exams.
D．They organize their own laboratory work.
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