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听力原文:W: Hello, Tom. M: Hello, Mother. W: I want to buy David a pet for his birthday. M: Yes, I know. W: What shall I give him? M: Why don't you buy him a dog? He likes dogs because they are friendly. W: But he' s already got a dog. M: Yes, that's true. What about buying a cat? Cats eat mice. W: But he's got a pet mouse. Prod lie can't take a eat for a walk, can he? Anyway, I want to buy him something unusual. M: You could buy him a rabbit. W: A rabbit? What can he do with a rabbit? M: Well, rabbits are very pretty. He can feed it, and play with it. He can build a house for it. He likes building things. W: I don't think that's a very good idea. Rabbits aren't interesting. What about a snake? M: A snake? W: Lots of people have snakes. They me very clean and easy to look after. And they're very unusual pets. David likes snakes. M: I don' t. No, don' t buy a make. I don' t want to open my bedroom door and find a snake. W: What do you suggest then? M: Why don' t you buy a bird? They've got some parrots at the market. They've very pretty and they can talk, too. Parrots are unusual. W: I don't like birds. They everywhere, and they make a lot of noise and a lot of mess. M: Oh, I really don' t know what else I can suggest. W: I want to buy something unusual. (23)