单项选择题

A．To sell and to inform.B．To increase prices and compet……

A．To sell and to inform.
B．To increase prices and competition.
C．To change the means of selling and buying.
D．To take away chances of choosing from customers.

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单项选择题A．Mother and son.B．Father and daughter.C．Teacher and student.D．Husband and wife.

A．Mother and son.
B．Father and daughter.
C．Teacher and student.
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