一、检测学情学生对光和影知识有了一定的经验,为了进一步了解学生的情况,我们在课堂上为学生设计画图练习。太阳从清晨到晚上,在空中的位置有了变化,那么阳光下的影子有变化吗?让学生进行推测并在图中画出物体的影子。为此我们为学生设计了画图练习,然后利用电子白板展示并画图。 First, the detection of students with knowledge of light and shadow have some experience, in order to further understand the situation of students, we in the classroom design drawing exercises for students. The sun changes its position in the air from morning till night, so do the shadows in the sun make students speculate and draw objects in the picture? To this end we designed a drawing practice for students, then use the electronic whiteboard display and drawing.