单项选择题 塑料饰面材料不包括（）。

单项选择题 听力原文：W: Hello. Can I help you?M: Yes, er. . . I am going to see the West End. W: How much time do you have?M: Just one day. W: Well, what do you particularly want to do?M: I want to visit museums, art galleries, Buckingham Palace, do some shopping, go to the theater. . . W: But you only have one day!M: That's right. W: Well, you can go shopping in the morning. M: Where?W: In Oxford Street. M: How do I get there?W: You can walk through Hyde Park. It's quite near. M: Good. What time do the shops open?W: At nine. M: Are there any restaurants in Oxford Street?W: Yes, there are lots. You can have lunch there. M: Are there any museums near Oxford Street?W: Yes, the British Museum. You can go there in the after noon. M: Good. What time does it close?W: At five. M: I want to go to the theater in the evening. W: Well, there are many theaters near there. M: Where?W: In Shaftsbury Avenue. You can take a bus from the British Museum. M: Perfect. Thanks for your help. W: You're welcome. Have a good time!What city is being talked about in the dialogue?

单项选择题 交易双方约定在合约有效期内，以事先确定的名义本金额为依据，按照约定的支付率相互交换一系列现金流的合约。金融互换是( )理论在金融领域最生动的运用。