单项选择题

A．Toothpaste, shampoo and washing powder.
B．Different brands of the same product.
C．Performance, price, value for money, quality & reliability.
D．Freedom of choice for the producer.
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单项选择题
A．Doctor and patient.B．Teacher and student.C．Husband and wife.D．Shopkeeper and customer.
A．Doctor and patient.
B．Teacher and student.
C．Husband and wife.
D．Shopkeeper and customer.
单项选择题
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.
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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