这篇课文是自读课文。自读课文应体现学生自读为主,教师引导为辅。学生能否自读,关键在于能否把学过的知识自觉地运用起来,做到举一反三,触类旁通。但是有些自读课文中的知识内容,学生过去没有接触过或很少学习过,这便成了学习的难点。为了使学生能顺利地自读,教师就应适当地给予指点。这篇文章,总的来说不难理解,但从“自读提示”和“思考和练习”的要求来看,一般学生的难点有二。 This text is a self-reading text. Self-reading texts should reflect students’ self-reading and teachers’ guidance. The key to whether or not a student can read on his own lies in whether he or she can consciously use the learned knowledge and do it by analogy. However, some of the content of the self-reading texts, students have not had contact or rarely learned before, which has become a difficult learning. In order to enable students to read themselves smoothly, teachers should give appropriate instructions. This article is not difficult to understand in general, but from the requirements of “self-reading tips” and “thinking and practicing”, there are two difficulties for the average student.