今天我要上一堂复习课,按照惯例在课前我备好了课,仔细翻阅指导用书,这二年级国标本教材我已教过一次,觉得比较得心应手,也没多花时间认真钻研。按我的经验,这节课没有什么难点,学生也容易接受。可今天,我却偏偏出了小纰漏。新课程提倡培养学生的估算能力,在我上的课中正好有一 Today I am going to a review class. As usual, I prepared the lesson before class and carefully read the instruction book. I have taught this second grade national standard textbook once and feel more handy and did not take the time to seriously study. In my experience, there is no difficulty in this class, students are also easy to accept. Today, however, I have chosen a small mistake. The new curriculum promotes students’ ability to develop estimates, exactly one in my class