单项选择题

A．By talking to an expert.
B．By reading an article.
C．By attending an exercise class.
D．By listening to the radio.
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单项选择题
A．Father and daughter.B．Teacher and student.C．Doctor and patient.D．Boss and secretary.
A．Father and daughter.
B．Teacher and student.
C．Doctor and patient.
D．Boss and secretary.
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