教学四年级上册“平行与相交”中平行线的画法时,我让学生尝试练习之后阅读例题,接着示范讲解,再进行相关作图练习进行巩固。在尝试练习时,我发现有部分模仿能力强的学生能够正确作图,而大多数学生都遇到了困难——尺子总是摆不对。我不得不重新演示一遍,边演示边讲解要领,之后让学生模 Teaching fourth grade on the book “parallel and intersect ” in the parallel lines of the painting, I let the students try to read the examples after practice, and then explain the model, then the relevant drawing exercises to consolidate. When I tried to practice, I found that some of the imitative students were able to map correctly, while most of the students had difficulties - the ruler was always wrong. I had to re-demonstrate it again, while the presentation to explain the essentials, and then allow students to die