听力原文：WOMAN: How long have you been a tree-climber, Mr Saw? MAN: I have been a tree surgeon and qualified tree-climber for the last 30 years. WOMAN: How did you start? MAN: I was encouraged to climb trees for the Parks Department when I left school at 14, because I was then quite small—only five feet, in fact-and not afraid of heights. It was really a natural profession for me and my mates to do out of school. WOMAN: Did you have any formal training? MAN: Oh yes. I went to Merristwood College in Surrey. I followed a course on tress-care and tree-climbing and I learnt the basics of tree-climbing there-techniques like how to throw a rope over the branches of a tree, climb up it and get into a harness, that sort of thing. WOMAN: What sort of things are you asked to do? MAN: Well, the work is extremely varied-anything from rescuing cats to conducting surgery on the tree. WOMAN: What is the most exciting job you have done? MAN: Well, last year I was contacted by Jersey Zoo. They were conducting a bat conservation program and this involved research work in the Comoros Islands. Apparently they had been forced to abandon the project once because they couldn't actually catch any of the fruit bats, which live at the top of fig trees. So they called me in for advice on tree-climbing and I ended up going on the trip. Catching a fruit bat up a tree isn't easy, but it was a great experience. Unfortunately, it's not the sort of thing you do everyday. WOMAN: Have you ever fallen out of a tree? MAN: Never. Although I've tackled trees over 100 feet high. Mind you, I wouldn't be around to talk to you if I had made a habit of falling! WOMAN: Do you still climb trees? MAN: Very rarely, I'm a bit too old for climbing about in trees now. I have a job lecturing on tree-climbing at a college. Of course, if I was asked to return to Comoros, I'd go like a shot. That's the sort of opportunity I couldn't miss. Questions: 27.When did the man begin to climb trees? 28.What's the conversation mainly about? 29.Which of the following is NOT .included in the training of Merristwood College? 30.What's the most exciting job the man has ever done? (47)