黄铜是铜和锌的合金，在20g黄铜样品中加入足量稀盐酸使其完全反应，生成氢气0.2 发布时间：2017-06-29 11:42 │ 来源：www.tikuol.com 题型：问答题 问题： 黄铜是铜和锌的合金，在20g黄铜样品中加入足量稀盐酸使其完全反应，生成氢气0.2g，求样品中铜的质量．
题型：问答题 完形填空。 When I was in the third grade, I was chosen to be the princess in the school play. For weeks my mother had helped me practise my lines. But once on the stage, every word 1 from my head. Then my teacher asked me to change my role to be a narrator (解说者) for the play. 2 I didn't tell my mother what had happened that day, she noticed my 3 and asked if I wanted to take a walk in the garden. It was a lovely spring day. We could see dandelions (蒲公英) popping (炸开) 4 the grass in bunches (束). I watched my mother bend down by one of the bunches. "I think I'll dig up (挖光) all these weeds (野草)," she said. "From now on, we'll 5 have roses in this garden." "But I like dandelions," I protested (抗议). "All flowers are 6 -even dandelions!" My mother looked at me seriously. "Yes, every flower gives pleasure in its own way, doesn't it?" she asked thoughtfully. I nodded."And that is 7 of people, too," she added. When I 8 that she had guessed my pain, I started to cry and told her the truth. "But you will be a wonderful narrator," she said, 9 me of how much I loved to read stories' aloud. Thanks to my mother's encouragement, I got to know everybody had his or her own 10 in the world. I felt proud of the role in the play. ( )1. A. developed ( )2. A. If ( )3. A. difficulty ( )4. A. through ( )5. A. hardly ( )6. A. harmless ( )7. A. true ( )8. A. remembered ( )9. A. representing ( )10. A. honor B. left B. Because B. mistake B. past B. only B. healthy B. kind B. realized B. complaining B. progress C. failed C. Though C. danger C. beyond C. still C. beautiful C. same C. explained C. recommending C. value D. disappeared D. Since D. unhappiness D. behind D. also D. fresh D. clever D. promised D. reminding D. interest 查看答案