《养蝌蚪》中认识蝌蚪生长发育过程是这一课的重点难点。往年利用挂图、投影进行教学,学生课上无精打采,没有兴趣,教学效果不理想。今年我特意找来了有关青蛙的光盘资料,用动画的形式来演示蝌蚪这一变态过程。课堂上,学生看得津津有味、兴趣盎然、气氛活跃。但几天后 “Tadpoles raising” understanding of tadpoles growth and development process is the focus of this lesson difficult. In previous years, the use of flip charts, projection teaching, poor students in class, no interest in teaching results are not satisfactory. This year I deliberately got the CD information about frogs, animated to demonstrate the metamorphosis of tadpoles. In the class, the students are full of energy, interest and active atmosphere. But a few days later