【正确答案】
B
【答案解析】[解析] 23-25
M: Excuse me, could you help me please?
W: I hope so. What is your problem?
M: I bought this hair dryer in your store last Thursday. It worked just fine for three days. Then Monday morning when I turned it on, the fast speed would not work.
W: Are you quite sure it worked when you bought it?
M: Yes, quite.
W: Did someone drop the dryer or knock it off the table?
M: No, no one damaged it in any way. It still works fine on low speed.
W: Let me take a look. You are right. It doesn't look as though it has been damaged, but it is not working properly. Our policy is to replace such an item. Wait just a moment.
M: Thank you.
23. What is the man's problem according to the conversation?