一个班级的学生，其学习成绩有好、中、差之分，而学习成绩中等的学生占绝大部 分，因此，提高中等学生的整体水平是提高全班学习成绩的关键。而我们在教学实践中，往 往关注两头忽视中间。学习成绩好的学生受到教师的表扬和关注，学习成绩差的学生即所谓 的“学困生”，也是 Students in a class have good, middle, and poor academic scores, while students with a moderate academic achievement account for the majority. Therefore, improving the overall level of middle school students is the key to improving the academic performance of the entire class. In our teaching practice, we tend to pay attention to neglecting the middle. Students with good academic performance receive praise and attention from teachers. Students with poor academic performance are the so-called “study-poor students”.