我们写文章总要求“凤头、猪肚、豹尾”,讲课也是这样。一则设计完美的导语犹如一篇优美文章的开头,要求简洁,生动,传神;又如一口清新山泉的泉眼,清洁、通畅、不竭,才能使后面的课堂教学,泉水般一泄而出,汪洋恣肆,左右逢源。这一点在议论文的教学上尤为明显。下面,笔者就以初中 When we write articles, we always ask for “Crested, Pork Belly, Leopard Tail,” and the same is true of lectures. A perfectly designed introduction is like the beginning of a beautiful article. It requires concision, vividness, and vividness; and like a spring of pure spring, clean, unobstructed, and inexhaustible, can make the back of the classroom teaching, like a spring water, Wang Yang, right and left. This is particularly evident in argumentation teaching. Below, the author takes junior high school