A、Perfect. B、Businesslike. C、Friendly. D、Acceptable. A根据句(7)可知，主持人向Lida读了投诉信后，Lida评价说，这封投诉信非常完美。因此答案为[A]。

M: You know what, I have here an example of a complaint letter. This is on the Sarasota, Florida, public school system’s website, and it was written to this clothing company. And this is a letter about some shoes, and it begins " To Whom It May Concern: On September 20, I ordered by phone a pair of brown leather Peace Mules for $ 36. 99, which includes $ 4. 99 for shipping and handling. When they were delivered to my home, the package was wet and the leather shoes were ruined. I am returning the shoes. I realize the shipping and handling fee is non-refundable, (6) but I would like the original amount of $32 to be refunded. Thank you for your attention to this matter. Sincerely..." and she signs it here. So what do you think of that?
W: (7)I think that’s a perfect letter of complaint. (8) She states what the problem is. She states what correction she would like the company to make. The tone is neutral; she doesn’t come across as angry or demanding. It’s short, you know, there’s nothing extra there, so that the person reading the letter doesn’t have to go hunting through the letter for what it is that happened and what the person wants. And getting back to the classroom now, if we wanted to give our students experience learning how to write letters of complaint, we would show them several examples. We would then give them a situation in which there was something to complain about, and we would ask them to write a similar letter using one of the models that we’ve provided, like the one that you’ve just read. What is much harder, of course, is for people to get experience complaining verbally in person. And so once we have demonstrated several scenarios in which complaining takes place, and we’ve analyzed the language and structures that go into complaining, (9) the final step—and perhaps the most important one—is to give students practice complaining in a sheltered environment, in other words, in the classroom. And I would do that by means of role-playing.
M: (10) Lida Baker teaches English and writes textbooks in Los Angeles, California. And that’s all for this week. Thank you for your valuable advice, Lida.
W: You are welcome.
This is the end of Part Two of the interview. Questions 6 to 10 are based on what you have just heard.
6. In the example of the letter of complaint, how much does the writer want to be refunded?
7. What does Lida think of the example of the letter of complaint?
8. What is considered unnecessary in a letter of complaint?
9. What is the most important step in teaching how to write letters of complaint?
10. What kind of books does Lida write?