纵观生物教学的全过程,如果从教学输入信息为参照坐标,那么,不难发现,教学反馈信息相对于输入信息存在着不同的位置,存在着明显的时间差。由此,我们可以将教学反馈划分为以下三类:超前反馈、同步反馈与滞后反馈,其时间差分别为正时差、零时差与负时差。一、超前反馈与正时差良好的教学效果的获得,主要取决于教学过程的全面控制。在生物教学中,教师根 Throughout the whole process of biological teaching, if the teaching input from the teaching as a reference, then it is not difficult to find that the teaching feedback information relative to the input information exists in different positions, there is a clear time difference. Therefore, we can divide the teaching feedback into the following three categories: advanced feedback, synchronous feedback and lag feedback. The time differences are positive time difference, zero time difference and negative time difference respectively. First, the advanced feedback and timing difference Good teaching effectiveness, mainly depends on the overall control of the teaching process. In biology teaching, teacher root