“地球上的昼夜长短变化”是高中地理教材中有关“地球运动”的经典内容。“让学生经历问题解决的过程来促进建构学习”是本节课教学设计的核心,“情境创设”是设计最重要的内容,“实验模拟”和“小组协作”是主要途径。下面是本课所运用的任务情境设计。【任务一】本任务将使用地球仪和卡纸,其中卡纸用以代表晨昏圈所在的平面。观察图中太阳光线的来源和地轴的倾斜方向,将卡纸摆放到地球仪上,模拟 “The diurnal variation of the earth ’s day and night” is the classic content of “earth movement” in high school geography textbooks. “Let students go through the process of problem solving to promote the construction of learning ” is the core of this lesson teaching design “situational creation ” is the most important part of the design, “experimental simulation ” and "group collaboration Is the main way. Below is the task situation design used in this lesson. 【Task 1】 This task will use the globe and the jam, where the jam is used to represent the plane where the twilight circle is located. Observe the source of the sun’s rays and the tilt of the Earth’s axis, place the jammed paper on a globe, and simulate