一、“活化”了生物教材,丰富了课堂初中生物本身就是一门揭示生命现象和本质的自然科学。单凭干枯的文字叙述,是无法让学生深切感知知识的魅力,电教媒体突破了原有的口述、回忆等传统教学的界限,生动形象的展示认识对象,能够有力地“活化”生物教材。使学生能直观地看到宏观世界、微观世界、远方或过去的事物,使信息通道得到了无限的延伸和扩展,有利于学生更快更准确地理解授课内容。学生是一个能动的主体学习者,多媒体的直观形象能激活学生求知的思维神经,促 First, “Activation ” biological materials, enriching the classroom Junior high school biology itself is a reveal of life phenomena and nature of the natural sciences. The mere dry writing narration can not make the students deeply perceive the charm of knowledge. The audio-visual media breaks through the boundaries of the traditional teaching such as oral and remembrance, vivid images to show the objects of cognition, and can effectively “activate” biological teaching materials . Enable students to intuitively see the macro-world, the micro-world, distant or past things, the information channel has been unlimited extension and expansion, help students understand the lecture content faster and more accurately. Student is an active subject learner, the visual image of multimedia can activate students’ knowledge of the nerve, promote