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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.
A．By talking to an expert.
B．By reading an article.
C．By attending an exercise class.
D．By listening to the radio.
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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