古语说“学起于思,思起于疑”,可见,思维是从问题开始的。但是,并非每个问题都能引起学生积极的思维,那种浮于浅表的问题,学生脱口而出;而那些过于艰深又脱离学生实际的问题,也会阻塞学生思维的通道,扼煞他们 As the old saying goes, “Learning from thinking, thinking from doubt”, we can see that thinking starts from the problem. However, not every problem can arouse the students 'positive thinking, the superficial problem that students blurt out; those who are too difficult to get rid of the actual problems of students will also block the students' thinking channels and stifle them