[片断]……师:我们已经认识了圆的圆心、半径、直径,那么你还想提出哪些值得研究的问题?……师:下面请同学们四人一组,从老师课前送给大家的礼物中,你能有什么新的发现?并针对自己的发现,说说自己是怎么研究的?看哪个小组完成的最好。这时,同学们议论纷纷,有的在说自己的想法,有的计划着,有的相互争论着……之后,学生们争先恐后地要求发表自己的看法。 [Fragment] ...... Teacher: We have seen the circle center, radius, diameter, then you want to put forward what is worth studying the problem ... ... Teacher: Here are four students, from the teacher before class to everyone , What new discoveries can you have and how to study for your own discovery? See which group is the best. At this time, the students talked about each other, some said their ideas, some plans, and some mutual controversy ...... After that, students vying to ask for their own views.