在生物教学中，我们教师应十分注重演示实验的教学探究和创新，以培养学生坚强的意志、严谨治学的自主创新精神。如在初二视觉的形成［双凸透镜成像实验］中，按教材要求是用一白纸板，凸度不同的双凸透镜和一支点燃的蜡烛，使它们处在适当的位置，而在白纸板上观察到一个清晰 In biology teaching, our teachers should pay great attention to teaching experimentation and innovation in demonstration experiments to cultivate students’ strong will and rigorous academic innovation spirit. For example, in the formation of the second grade vision [bi-convex lens imaging experiment], according to the teaching materials, a white cardboard, a convex lenticular lens and a lit candle were used to make them in proper positions on the white cardboard. Observed clearly