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