【正确答案】
B
【答案解析】[听力原文] Not every service or product meets your satisfaction. When you are dissatisfied, you should voice your dissatisfaction. One reason for doing so is to help the vendor know there is a problem. The problem may have been created at a lower level in the vendor's company, and the vendor himself may know nothing about it at all. You help him when you bring weaknesses or failures to his attention. A second reason for writing a letter of complaint to a vendor is to seek compensation. You may not wish to pursue the matter so far as to take legal action, but you may wish to give the vendor the opportunity of making good. Most vendors value their business and reputation, and they may actively replace defective goods or refund money when necessary. This is the preferred way of making a vendor answer your complaint. No vendor likes to do so, but your carefully worded letter of complaint may motivate him to do so. When you write a letter of complaint, you'd better keep these tips in mind: Firstly, be polite, though firm. You will not win a vendor's cooperation by anger. Secondly, be reasonable. Show logically and factually that the fault lies with the vendor. Thirdly, be specific about what is wrong and what you want. Lastly, tell how you have been hurt or inconvenienced by the problem. This strengthens your argument for compensation. According to the speaker, how can you express your dissatisfaction? 短文开头部分提到，当你对卖家的服务或商品不满时，你应该表达出来，接着谈到了这么做的原因，在谈到第二个原因时提到了表达不满的方式可以是写投诉信。因此答案B符合短文内容。