摘要:A: Hello, Peter! 1 B: Certainly! 2 A: Which of these do you think is the most useful invention, a computer, a telephone or a television? B: 3 the most useful one is a computer. A: Why is that? B: Oh, I think it can help us work and play. A: 4 when it was invented? B: 5 , I don’t know. a. What is it used for? b. May I ask you a question? c. Sorry. d. What is it used for? e. I think f. What is it? g. Do you know

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