Who should eat well first? Activity goal: 1. On the basis of sorting things according to a certain feature, try to sort them in reverse. 2. Understand the content of the story, feel the wisdom and wisdom of the caterpillar, and establish self-confidence. Activity focus: Help children change from positive thinking to reverse thinking, stimulate children's thinking and promote their ability to think from different angles. Difficulties in activities: under the guidance of a series of suggestive questions, help children understand the meaning of pictures, and through comparison, understand the actual meaning of scales and sort them. Activity preparation: a set of operation materials such as small animal cards. The ppt activity flow of the story: 1. The story leads to stimulate interest; 2. Appreciate the story picture book and queue up according to the different characteristics of the animal body according to the story content; 1. Beast ratio 1 and Beast ratio are high and short, and line up in the order of high to short. Tell me the reasons for eating peaches in this order. (2) The length of the animal's tail and ears. 2. Children's operation: prompt children to choose a favorite animal (rabbit or monkey) and sort the length. 3. Discussion summary: (3) Animal specific gravity 1, problem guidance: 2. Comparison of children's observation III. Children's operation: sort from heavy to light. Animals should test everyone and line up according to their weight from heavy to light. Let's see who can eat peaches first, who can eat peaches second and who can eat peaches last. 4. Discussion summary: Third, children put caterpillars in the first place. 1. Ask questions and make people think. 2. Children's operation: the height, ear and tail length and weight rank first among caterpillars.