教案（章节备课） 学时4 章节 Unit 3 The Origin and Composition of Soil 教学目的 和要求 了解土壤的组成和起源，并掌握有关此方面的单词和短语 重点 难点 土壤成分的组成和形成 Unit 3 The Origin and Composition of Soil READINGAND COMPREHENSION Soil is a residue composed of two main ingredients The process of soil formation results in the development of the soil profile 教学进程 Any mpe of contins particles of differents izes (含章节 Any soil contains both mineral and organic matter 教学内容、 LANGUAGE IN USE 学时分配、 Making tables from descriptions 教学方法、 Writing descrption from tables 辅助手段) III:GRAMMAR Comparative sentences Contrastive sentences Making comparisons by inference IV:SUMMARY CHECK LANGUAGE IN USE Exercise A Making tables from descriptions Exercise B Writing description from table 本章思考题 GRAMMAR Exercise A Comparative sentences Exercise B Contrastive sentence ExerciseC Making comparisons by inference SUMMARY CHECK 主要 参考资料 备注4 教案（章节备课） 学时 4 章 节 Unit 3 The Origin and Composition of Soil 教学目的 和要求 了解土壤的组成和起源，并掌握有关此方面的单词和短语 重 点 难 点 土壤成分的组成和形成 教学进程 （含章节 教学内容、 学时分配、 教学方法、 辅助手段） Unit 3 The Origin and Composition of Soil I: READING AND COMPREHENSION Soil is a residue composed of two main ingredients The process of soil formation results in the development of the soil profile. Any sample of soil contains particles of different sizes Any soil contains both mineral and organic matter II: LANGUAGE IN USE Making tables from descriptions Writing description from tables III: GRAMMAR Comparative sentences Contrastive sentences Making comparisons by inference IV: SUMMARY CHECK 本章思考题 LANGUAGE IN USE Exercise A Making tables from descriptions Exercise B Writing description from table GRAMMAR Exercise A Comparative sentences Exercise B Contrastive sentences ExerciseC Making comparisons by inference SUMMARY CHECK 主要 参考资料 备注