Such behaviors as communicating complex ideas and using tools are not unique to human any more.

A．consumers are exposed to various goods at low prices.
B．consumers are offered satisfactory service.
C．consumers have rights to change goods.
D．consumers are well informed about goods.

A．Some customers are the shareholders of a store.
B．Department stores offer more service for customers.
C．Customers think they are kings.
D．Customers are respected as a king in business circle.