【正确答案】 B

【答案解析】[听力原文]
   W: Yes, can I help you?
   M: Yes, you see I bought this personal stereo at your shop three days ago, and I'm afraid that it hasn't really matched up to what I was told about it.
   W: I see. What exactly is the matter?
   M: Well, first of all, there is this large scratch across the front of it.
   W: But you should have noticed that when you bought it.
   M: But it was in the box and all sealed up.
   W: Well, I'm sorry. But it really is your responsibility to check the goods when you buy them. How are we to know that it wasn't you who made the scratch?
   M: That was ridiculous! But anyway, it's not the most important thing. I really am not happy about this other thing.
   W: And what is that?
   M: Look! It says here that the noise from it should be undetectable by other people.
   W: Yes, that's right.
   M: But people can hear it and it's really embarrassing on the bus and the underground.
   W: Well, I'm sorry. But it must be the way you are wearing the headphones.
   M: Look! I know how to put earphones in my ears. Thank you very much! But what I want to know is what you are going to do about it at all!
   W: Well, I suppose we could exchange it for another model if you really aren't happy with it.
   M: No, I certainly am not!
   W: Well, if I could just have your receipt?
   M: Oh, yes. Well, There is a slight problem about the receipt...
   Why didn't the customer notice the scratch on the product?
对话中顾客反映他新买的随身听有一个大刮痕，店员问他怎么在购买时没发现，顾客回答说他没打开包装，也就是说，顾客没有检查产品。故选B项。虽然录音中提到随身听密封在盒子里，但这不是最直接的原因，因此C错误。