课的教学设计初衷是立足于学生的实际,着眼于学生探究兴趣的激发和学生思维能力的提升,以情境和线索不断引导学生.这节课设计的最大特点就是“利用线索性结构化的视觉情境,赋予探究过程情趣与动机”.即设置情境,为学生提供丰富的感性认识,让学生经历探究过程,体验探究乐趣和成功喜悦. The original intention of teaching design is based on the actual students, focusing on the students to explore the interest of excitement and the improvement of students’ thinking skills, context and clues continue to guide students. The most important feature of this lesson design is “the use of linear structured Visual situations, to give the process of inquiry and fun. ”That is, set the situation, to provide students with rich perceptual knowledge, so that students go through the process of inquiry, to explore the joy of exploration and success.