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Unit 1 SignsLesson 1 Dont walk.习题1一、英汉互译。1、走：2、垃圾：3、对不起：4、No smoking.:5、 Dont litter.:二、单项选择。1. No.A. smoking B. move C. litter2. Dont.A. swimming B. food C. walk3. Simon says, Sit down. Dont.”A. stand up B. litter C. touch4. - Can I go to the bathroom?No.A. camera B. food C. bathroom5. Dont! Look left. Look right.A. walk B. touch C. litter