题目

某同学用如图所示装置制取纯净的氧气。试回答下列问题：                   （1）乙中Na2O2可能发生的反应有                             、                                                         （2）丙中NaOH溶液的作用是          ，丁中浓H2SO4的作用是                                           （3）若把原装置连接顺序改为：甲→丙→丁→乙→戊，则在装置戊中能否收 句型转换,按要求改写句子。 1.Simon gets up at half past six every morning.（用yesterday morning替换every morning） Simon_____ ______ up at half past six yesterday morning. 2. I was watching TV when you called me.(改为一般疑问句) _____ ______ watching TV when I called you? 3. Alex was doing his homework from eight to ten last night.(改为否定句) Alex_____ ______ his homework from eight to ten last night. 4. I was doing some cooking at that time.(对划线部分提问) ____ were you____ at that time? 5.The trip is exciting.(对划线部分提问) ____ do you ____ ____ the trip? 同义句转换。 6.You are too young to go to school. You are ____ ____ ____ you can’t go to school. 7. Welcome to China in spring, summer, autumn or winter. Welcome to China in_____ ______. 8. Can I help you? _____ _____ ____ I can do for you? 9.When she calls me, I’ll tell you at once. I’ll tell you_____ _____ ____ she calls me. 10. It isn’t meaningless, I think. I _____ think it’s______.