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听对话,回答问题。 1. How many hours a day does David work at the moment? [ ] A. 8 hours B. Less than 10 hours C. More than 10 hours 2. What is the reason for David's trouble? [ ] A. Too much sleep. B. Too much work. C. Too much exercise. 3. What is the idea the doctor gave him? [ ] A. Eat more and work less B. Eat more healthy food and do more exercise C. Have a good rest for four weeks