A、Buying a knife. B、Having a security check. C、Looking for his luggage. D、Booking a flight ticket. B推断题。问题询问“男士正在做什么?”本题看似细节题，但涉

W: Excuse me, sir. Is this your luggage?
M: Yes, it’s mine.
W: Would you please open it?
M: Sure, no problem.
W: This knife should not be taken onto the plane.
M: It’s only a small knife. I thought it could be brought onto the plane.
W: I’m sorry, but it’s restricted by the regulations.
M: It was a gift from my foreign friend and I want to keep it as a souvenir,
W: It that case, you can leave it at the airport and get it back when you return.
M: Good idea. Thank you very much.
6. What is the man doing?
7. Why does the man want to keep the knife?
8. What might the man do with the knife?