精心设计引言引言是一节课导入的关键，直接影响到学生对新课学习的兴趣。好的引言能给学生较强、较新颖的刺激，形成对本课新内容的“兴奋中心”，把学生的注意力吸引到特定的教学任务和程序之中，从而起到事半功倍的效果。如讲“洋流”时，我是从趣味故事开始的：二战时，英 Careful design Introduction Introduction is the key to the introduction of a class, directly affecting students’ interest in learning new lessons. A good introduction can give students stronger, more novel stimuli, and form a “center of excitement” for the new content of the lesson. It draws students’ attention to specific teaching tasks and procedures, and thus has a multiplier effect. For example, when talking about “current”, I began with a fun story: During World War II, the British