光合作用是新陈代谢的重点内容之一，也是本课的重点和难点。为使学生理解和掌握光合作用的原理，弄清光合作用过程中的物质变化和能量变化．我在教学中使用了自制的光合作用过程复合投影片，效果很好。现把该片的制作过程和使用方法说明如下：1制作1.1底片的制作取一张胶片按 Photosynthesis is one of the key aspects of metabolism and it is also the focus and difficulty of this lesson. In order to make students understand and master the principles of photosynthesis, it is necessary to clarify the material changes and energy changes in the process of photosynthesis. I used a homemade photosynthesis process composite slide in my teaching and it works well. The production process and use method of the film are described as follows: 1 Production 1.1 Production of negative film Take a film press