课堂是学生学习的主阵地。高效课堂是提高教学质量的根本途径,是课堂教学改革的方向。构建高效生物课堂是教师孜孜的追求,而前提则离不开课前的精心准备。精心备课是高效课堂的前提。没有预设的课堂是放任的,也是杂乱无章的,必然也是低效的。要创造高效的课堂,充分用好 Classroom is the main front for students to learn. Efficient classroom is to improve the quality of teaching the fundamental way is the direction of classroom teaching reform. Building efficient biological class is the diligent pursuit of teachers, but the premise can not be separated from the careful preparation before class. Careful preparation is a prerequisite for efficient classroom. No default classroom is laissez-faire, also chaotic, inevitable and inefficient. To create an effective classroom, make full use of