一、单刀直入 ,开门见山。上课即板书课题 ,并围绕课题提出一系列问题启发学生思考。这样导入 ,直接了当 ,清晰简明 ,使学生注意力迅速集中 ,思维迅速定向 ,快速进入角色。二、联系旧知 ,推陈出新。从“温故”出发 ,以退为进 ,诱其深入 ,激励探索。这样导入 ,前后联贯 ,体现认 First, single-handedly straight into the mountain. Classes are topics on the board, and a series of questions are asked around the topic to inspire students to think. Such introduction is straightforward, clear and concise, allowing students to focus quickly, thinking quickly and quickly entering the role. Second, contact old knowledge and introduce new ones. Starting from “recovering the old age”, we can use it as a retreat to entice them to deepen and encourage exploration. This import, before and after coherence, reflect