精讲多练是教学改革中必须继承的内容。但是多练并不是搞“题海战术”而现实工作中为了多练我们往往在无意中把学生赶入题海.使同学们在题海,这一苦海中挣扎。那么怎样才能把同学们从题海中拯救出来呢?经过多年的尝试发现一题多变是一种 Explaining and practicing more is the content that must be inherited in the teaching reform. But many practice is not to engage in “sea tactics.” In practice, in order to practice more, we often inadvertently push students into the sea. Students are struggling in the sea. So how can we save the students from the sea? After many years of trying to find a change is a kind of