单项选择题

A．A speed limit.
B．A speed -cheek,
C．A distance measurement.
D．A traffic-sign.
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单项选择题
A．Father and daughter.B．Teacher and student.C．Patient and doctor.D．Athlete and coac
A．Father and daughter.
B．Teacher and student.
C．Patient and doctor.
D．Athlete and coac
填空题
What is the passage mainly concerned with
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