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高质量的预设是教师发挥组织者作用的重要保证,它有利于教师从整体上把握教学过程,使教学能有序展开。但在实际教学中,学生状况的不确定性和非预期性是客观存在的。有时候教学生成的发展变化与教学预设相
The precondition of high quality is an important guarantee for the teacher to play the role of organizer. It helps the teacher grasp the teaching process as a whole and make the teaching develop orderly. However, in actual teaching, the uncertainty and unpredictability of student status is objective. Sometimes the development of teaching changes and teaching default phase