《食物链》是知识性较强的自然课,其内容比较丰富,让学生理解食物链的知识,培养学生抽象概括能力是本课的主要目的。 若以食物链的知识内容为中心分三个步骤来安排教学,认识食物链、食物网及人类与动植物之间的食物关系,能做到教学层次清晰,让学生掌握和熟记知识。但学生长期在这种模式中学习,思想很容易僵化,思维得 The “food chain” is a naturally informative nature course with rich contents. It is the main purpose of this course to enable students to understand the knowledge of the food chain and develop students' abstracted abilities. If we arrange the teaching in three steps based on the knowledge content of the food chain, we should understand the food chain, the food web and the food relations between humans and animals and plants so as to make the teaching level clear and enable students to master and memorize knowledge. However, long-term students in this model to learn, thinking is easy to rigid, thinking too