目前,大部分教师课堂教学时间的分布已近程式化:复习旧课一导入新课——新课讲授——小结练习。各阶段的时间分配也似乎有了约定的标准:复习旧课环节一般不超过5分钟,分为教师复习、提问学生、师生共同复习三种方式;导入新课环节原则上也不超过5分钟,只要切入新课自然、新颖、能够激发学生兴趣,就已达 At present, the distribution of most teachers’ classroom teaching time is nearly stylized: review old lessons and introduce new lessons - new lesson lectures - summary exercises. The time allocation in each stage also seems to have the agreed standard: the review of old courses is generally not more than 5 minutes and is divided into three methods: teacher review, questioning students, and teacher-student joint review; the introduction of new courses is also not more than 5 minutes in principle , as long as the new lesson is natural, novel, and can stimulate student interest, it has already reached