题目

完型填空：(20’) My father often works very hard. And he   21   goes to the movies. Here I will tell you a   22   story about him.        One afternoon, when he finished his work, and   23   go home, he found a film ticket under the glass on his desk. He thought he   24   to have not much work to do that day and   25   was quite wonderful to pass the evening at the cinema.        So he came back home and   26   finished his supper. Then he said good-bye to us and left..        But to our   27  , he came back about half an hour later. I asked h某课外活动小组为研究由锌和铜组成的黄铜样品中各成分含量，做了以下实验．取黄铜样品粉末20g于烧杯中，将100g19.6%的稀硫酸分2次加入烧杯中（假设每次均充分反应），得到以下数据：加入稀硫酸的次数第1次第2次加入稀硫酸质量/g5050生成气体的质量/g0.200.10已知：锌与稀硫酸反应的化学方程式为Zn+H2SO4=ZnSO4+H2↑，计算：（1）生成气体的总质量为 g．（2）样品中铜（Cu）的质量为 g．（3）完全反应后所得溶液总质量分数是？（精确到0.1）．