“铃……”上课了。我像往日一样，快步走进教室，猛然间发现黑板上字迹斑斑，我刚想发作训斥值日生，但转念一想，又抑制住了刚才的冲动。我和颜悦色又诙谐幽默地说：“唉呀，老师看出来了，今天的值日生给老师出了一道题，是想考一考老师会不会擦黑板好吧下面老师来擦黑板， “Bell ...” class. As I always did in the past, I walked abruptly into the classroom. Suddenly I found traces of writing on the blackboard. I just wanted to make a reprimand for the day, but after I considered it, I was restraining my impulse. I am pleasant and witty and humorous to say: "Oh, the teacher saw it, the value of today's day to the teacher out of a question, is to test a test teacher will not wipe the blackboard Well below the teacher to wipe the blackboard,