学习情景是指与学习内容相关的知识文化背景,学习环境和各种活动,学习情景既蕴含了一定的知识内容和学习任务,又渗透着学习者的动机和情感.[1]在教学中创设教学情景,发挥情感在教学中的作用,使学生学习兴趣得到很好的激发.本课题的教学围绕着四条线展开:目标线为暗线,情景线,问题线,知识线为三条明线,四条线构成科学的动态结构的课堂. Learning scenarios refer to the knowledge and cultural background, learning environment and various activities related to the learning content, which contains not only some knowledge and learning tasks, but also the motivation and emotion of learners. [1] Teaching situation, to play the role of emotion in teaching, so that students interest in learning is well stimulated.This subject teaching around four lines: the target line for the dark line, the situation line, the problem line, the knowledge line for the three open lines, the four lines The classroom that forms the dynamic structure of science.