课堂活动是不是越多越好呢?实际上不是的。例如,我在一次“物质的溶解现象”公开课前的两次磨课及在张家港常青藤学校上全市展示课中深有体验。当时我先按照教参、书本上的方法与学生探究学习物质在水中的分散情况,并由此学习悬浊液、乳浊液、溶液。虽然也上完了一堂课,但总觉得实验和我的讲解都很多余,后经备课组商量,大胆地改进方法,先让学生自学,老师给出预习提纲辅助。如,1.你生活中见到过把什么 Class activities is not the better? Actually not. For example, I had two in-class exams before an open class “Material Dissolution Phenomenon” and a deep experience in the city’s demonstration classes at the Ivy League School in Zhangjiagang. At that time, I first explored the dispersion of learning materials in water according to the teaching instructions, the methods in the books, and the students learned suspension, emulsion and solution. Although I also finished a lesson, I always felt that there were many experiments and explanations. After discussing with the lesson preparation team, I boldly improved the method. Students should be taught by themselves and the teacher should give a preview outline. For example, 1. What have you seen in your life?