“好的开头是成功的一半”,引入新课是教学过程中最重要的环节之一,是整节课堂教学的“序曲”,它负有酝酿情绪、带入情境、设疑激趣、渗透主体的重任。恰当地引入新课具有温故知新、承前启后的作用,能引起学生的注意和学习兴趣,能抓住学生的好奇心理,调动学生的积极性和主动性, “The good beginning is half of the success.” Introducing the new lesson is one of the most important aspects of the teaching process. It is the “overture” of the whole class of teaching. It has brewing emotions, brings into the situation, doubts, and infiltration. The main responsibility. Introducing the new class appropriately has the function of advancing knowledge, understanding knowledge, and forging ahead. It can arouse the attention of students and interest in learning. It can capture the curiosity of students and mobilize the enthusiasm and initiative of students.