参考答案

正确答案：
Dear Sir or Madame,
　　 As one of the regular customers of your online store, I am writing this letter to express my complaint against the flaws in your product—an electronic dictionary I bought in your shop the other day.
　　 The dictionary is supposed to be a favorable tool for my study. Unfortunately, I found that there are several problems. To begin with, when I opened it, I detected that the appearance of it had been scratched. Secondly, I did not find the battery promised in the advertisement posted on the homepage of your shop, which makes me feel that you have not kept your promise. What is worse, some of the keys on the keyboard do not work.
　　 I strongly request that a satisfactory explanation be given and effective measures should be taken to improve your service and the quality of your products. You can either send a new one to me or refund me my money in full.
　　 I am looking forward to your reply at your earliest convenience.
　　 Sincerely yours,
　　 Zhang Wei