上课铃响了,只见于老师迈着不紧不慢的步伐走进教室,他什么也没说,拿起一支粉笔转身在黑板上写了1-9这几个数字。同学们你看看我,我看看你,每个人的脸上都写满了问号。老师的葫芦里卖的是什么药?这到底上的是语文课还是数学课?正当同学们疑惑不解时,老师说:“把1-9这9个数字分成三组,要有一定的依据和标准,只要言之有理即可。” The bell rang, I saw the teacher walking slowly into the classroom, he did not say anything, picked up a piece of chalk and turned to write on the blackboard 1-9 these figures. Students look at me, I see you, everyone’s face is filled with question marks. What is the medicine sold in the teacher’s gourd? In the end is the Chinese class or math class? While the students puzzled, the teacher said: “The 1-9 9 numbers are divided into three groups, there must be a certain Basis and standards, as long as justified. ”