题目

 2008年9月“神舟七号”载人飞船成功发射，其发射动力材料偏二甲肼C2H8N2遇N2O4后能自燃：C2H8N2+2N2O4=3N2+4H2O+2CO2 。但使用这种材料的火箭发射中对环境会产生诸多污染，下面对可能造成的污染的分析中不正确的是A．不完全燃烧时会产生COB．可能是排出的NO2会破坏臭氧层C．可能是燃烧产生的CO2会形成酸雨D．可能是剩余的燃料或氧化剂有毒而污染大气                                   B                       Shiyan No. 1 Middle School Rules You must                                      You mustn't* look clean and tidy             * bring radios or CD players to school* be quiet in the library         * run or shout in the school buildings * stay in the playground at break time   * talk loudly in the hallways* bring a letter from your parents if you’re ill * leave school at break time or at lunch time* stand up when a teacher comes into the classroom   * fight* arrive at school by half past seven           * wear jeans or trainers* hand in your homework on time          * eat or drink in the classroom假如你是实验一中的学生，请根据校规内容回答下列问题。6. What must you not do when youVe in the school buildings?                                                7. Can you leave school at lunch time?                                                8. What must you do when your teacher comes into your classroom?                                                9. What do the school rules say about fight?                                                10. When must you get to school every morning?