一、设计理念无论是按照认知发现理论还是按照建构主义学习理论均认为:学习者在一定情境中对学习材料的亲身经历和自主地进行探究活动的发现,才是学习者最有价值的东西,这种知识和经验的意义建构是无法由他人所代替的。因此在本节内容的教学过程中,以问题为纽带,利用资料、图片、视频等素材为学生创设教学情境,把简单知识的传授过程优化成一个科学探究过程。注意指导学生在讨论、交流中进行知识的构建,掌握基本的科学 First, the design philosophy Whether in accordance with the cognitive discovery theory or in accordance with the constructivist learning theory are that: learners in a certain context on the learning materials and self-exploration activities to explore the discovery is the most valuable thing for learners , The construction of the meaning of this knowledge and experience can not be replaced by others. Therefore, during the course of teaching in this section, we use questions, materials and pictures to create teaching situations for students and optimize the process of teaching simple knowledge to a scientific inquiry process. Attention to guide students in the discussion, exchange of knowledge to build, master the basic science