单项选择题

A．Doctor and patient.
B．Teacher and student.
C．Husband and wife.
D．Shopkeeper and customer.
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这说明他刚适应一种工作规律就又得转向另一种工作规律，因此在他大部分时间里，休息和工作的效率都很低。
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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