按照课堂教学的要求，教师必须“吃透两头”：一要吃透教材，做到“心中有本”；二要吃透学生，做到“目中有人”。教师充分利用课前准备的两三分钟和学生作多种形式的交流沟通，这是做到“目中有人”的最佳途径之一。我们通常把这种活动称作课前预热。成功的课前预热，可以缓 In accordance with the requirements of classroom teaching, teachers must “get through the two”: First, understand the textbooks and be “in the heart”; second, understand the students and be “someone in the head”. Teachers make full use of two or three minutes of preparation before class to communicate with students in various forms. This is one of the best ways to achieve “there is someone in sight”. We usually refer to this kind of activity as pre-school warm-up. Preheating before a successful class can slow down