“凡事预则立,不预则废”。作为一名普通的棋手只能预想到后几步棋,而专业的棋手却能预想到几十步。可见,只有充分的预计,才能临危不乱、运筹帷幄,最后达到决胜千里。一、精彩的生成离不开高质量的预设教学预设不是简单的、单维的、死板的、封闭的、主观的教学设 “Forewarned is forearmed, without prejudging the waste”. As a normal player, only a few moves can be expected later, and professional players can expect several tens of steps. Visible, only full predictability, to be able to endanger chaos, strategizing, and finally to achieve a thousand miles. First, the wonderful generation can not be separated from high-quality default teaching preset is not a simple, one-dimensional, rigid, closed, subjective teaching set