参考答案：taxi

解析：[听力原文] 5-8
W: Well, how are you Fred
M: Oh, haven’t been feeling too well lately, been having a bit of trouble with the back.
W: Hmm, | see. Hmm still driving the taxi
M: Yeah, still at it.
W: You’ve been in that game a while, Fred.
M: Yes, I’ve been at it for nearly twelve years now, but, ah lately it’s been getting on top of me a bit.
W: Oh, what do you mean
M: Well, I’ve been on the airport run, and I’ve been lifting a lot of heavy suitcases.
W: Hmm (pause) suitcases, huh Show me how you’ve been lifting these suitcases.
M: Oh, just the usual way, like this.
W: Ah, I think that’s the trouble. You’ve been lifting them the wrong way ! You should have used your legs, like this. It takes the strain off your back.
M: Oh, thanks, Doctor. I’ll do that.