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听对话,选择正确答案。每段对话读两遍。 1. How many times has Jack visited London before? [ ] A. Five times. B. Twice. C. Never before. 2. How many days has Jack been in London? [ ] A. One hour. B. Several months. C. Several days. 3. When will Jack have to return? [ ] A. In two days. B. In three days. C. In four days. 4. Is this Jack's fifth visit or sixth visit? [ ] A. Fifth. B. Sixth. C. I don't know. 5. What does Jack think of London? [ ] A. He thinks it's a wonderful place. B. He doesn't like here. C. He doesn't think it's a wonderful place.