题型：问答题 阅读理解。 The Smiths are from America. Mr. Smith works in a car factory in Shanghai. He is an engineer. He is a quiet man, and in his spare time he likes going fishing in the park. His wife Helen is a teacher. She teaches English in a middle school. Unlike her husband, she is very outgoing (外向的). She enjoys playing yoga with her Chinese friends. They've got a son, David. David is a primary school student. He likes playing football and basketball very much.The SmithsMembers(成员)Occupation(职业)Hobbies(兴趣)Character(性格)Mr. Smith 1 Going fishing 2 Mrs. SmithTeacher 3 4 David 5 Playing football andbasketball/ 查看答案
题型：问答题 （1）PH=12的氢氧化钠溶液加水稀释100倍，求稀释后的PH （2）常温下某强酸溶液pH=a，强碱溶液pH=b，已知a＋b＝12，酸碱溶液混合pH=7，求酸溶液体积V(酸)和碱溶液体积V(碱)的关系。 查看答案
题型：问答题 细铁丝在氧气中剧烈燃烧，食物腐败，铜在空气中生成“铜绿”。三种现象变化的共同点是①有热量放出 ②能发出光 ③有氧气参与反应 ④反应速率很大 [ ]A．①④B．①③ C．②④ D．②③ 查看答案