教学目标是一节课的总领原则,是教学活动的出发点和归宿地,为实现这一目标,教师往往通过“问题串”层层展开,节节攀升,最终达成教学目标,实现有效教学.本文以《指数函数》(第1课时)的两个片断做了很好的说明. The goal of teaching is the principle of the general principle of a class. It is the starting point and destination of teaching activities. To achieve this goal, teachers often develop through “problem strings” and rise steadily, eventually achieving teaching goals and achieving effective results. Teaching. This article is well illustrated by the two pieces of “Exponential Function” (Chapter 1).