The MDC Company was established in2001 and in four short years has become one of the most successful companies in the market place. For this，we are pleased，proud and grateful.
We are pleased because our customers have confirmed our belief that if the products we offer are new，exciting，innovative (有创意的. and of excellent quality，they will be purchased.
We are proud because we know we are a company that keeps its word to its customers：that guarantees that any product can be returned within 30 days if it proves to be unsatisfactory in any way;and that always lets our customers know if there is to be a delay in delivery.
We are grateful to customers like you，because you confirm our beliefs that good service and quality result in satisfied customers. Without you，there would be no reason for us to be pleased or proud. We thank you for your orders and for giving us the opportunity to be of service to you.
Our special summer catalogue (商品目录) is at the printers and should be in your home soon. We hope that you will be pleased with the new selections.
Yours faithfully
John Brown
The purpose of this letter is to _____.

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