“学起于思,思源于疑”,求知欲是从问题开始的,有疑问才能启发学生的探索欲望,使他们的思维处于主动、积极、愉快地获取知识的状态。在教学中,设置悬念,即向学生提出恰当的问题,激发起学生的兴趣,有助于调动他们学习的积极性。教师如果能恰到好处地发挥电教优势,精心设置悬念,激发学生 “Learning from thinking, thinking from doubt,” curiosity is from the beginning of the problem, there are questions in order to inspire students to explore the desire to make their thinking in a proactive, positive, happy state of access to knowledge. In teaching, setting up suspense, that is, asking students appropriate questions, arousing students' interest and helping to arouse their enthusiasm for learning. If teachers can play just right electric education advantage, carefully set the suspense to inspire students