单项选择题
A．tell the customers about the quality of their products B．express the company's thanks to the customers C．prove the excellent service of the company D．inform the customers of a new catalogue
A．the product can't be delivered on time B．the product is out - of - date and unsatisfactory C．the company doesn't accept the returned product D．the company can't send a new catalogue on time
A．gives them opportunities to order B．provides good service and quality C．guarantees the quickest delivery D．sends new catalogues to them