一、遵循学路，整体感知１．揭题后，让学生说说从“只有一个地球”这个课题中你想到什么？还想知道些什么？２．师整理归纳学生所提出的问题，然后让学生自由阅读课文解决问题。３．学生交流自学收获。４．学生再读全文，找出直接点明课题的段落。二、变序教学，提纲辐射１． First, follow the learning path, the overall perception 1. After exposing the question, let the students talk about what you think of from the subject of “One Earth Only”? Want to know what? 2. Teachers to summarize the problems raised by students, and then allow students to read the text to solve the problem. 3. Students communicate self-harvested. 4. Students read the full text to find out the paragraph directly points out the subject. Second, the sequence of teaching, outline radiation 1.