教案（章节备课） 学时4 章节 Unit 4 Drainage and Irrigation 教学目的 和要求 了解排水与灌溉的概念以及各自的功能和工具，并掌握有关此方面的单词和短语 重点 难点 排水与灌溉的区别 Unit 4 Drainage and Irrigation Ditching isone of the most important techniques for draining land. Irrigation:two main sources of irrigation water 教学进程 The amount of water which is required for irrigation depends on a number of factors (含章节 IL LANGUAGE INUSE 教学内容、 学时分配、 Definition.description and identification 教学方法 Classifications in diagrams and paragraphs Classification acconding to defining characteristics 辅助手段) IIL GRAMMAR We for which omething is done by uing. Instead of a to-infinitive we may use in order to +infinitive or so as to+infinitive to express purpose. IV:SUMMARY CHECK LANGUAGE IN USE EXERCISE A Classification and definition EXERCISE B:Definition.description and identification EXERCISE C:Classifications in diagrams and paragraphs 本章思考题 EXERCISE D:Classification according to defining characteristics GRAMMAR We can express the purpose for which something is done by usinga. Instead of a to-infinitive we may use in order to infinitive or so as to infinitive to express purpose. SUMMARY CHECK 主要 参考资料 备注 5 教案（章节备课） 学时 4 章 节 Unit 4 Drainage and Irrigation 教学目的 和要求 了解排水与灌溉的概念以及各自的功能和工具，并掌握有关此方面的单词和短语 重 点 难 点 排水与灌溉的区别 教学进程 （含章节 教学内容、 学时分配、 教学方法、 辅助手段） Unit 4 Drainage and Irrigation I: READING AND COMPREHENSION The meaning ofg drainage Ditching is one of the most important techniques for draining land. Irrigation : two main sources of irrigation water The amount of water which is required for irrigation depends on a number of factors. II: LANGUAGE IN USE Classification and definition Definition, description and identification Classifications in diagrams and paragraphs Classification according to defining characteristics. III: GRAMMAR We can express the purpose for which something is done by using a to -infinitive. Instead of a to-infinitive we may use in order to + infinitive or so as to + infinitive to express purpose. IV: SUMMARY CHECK 本章思考题 LANGUAGE IN USE EXERCISE A Classification and definition EXERCISE B: Definition, description and identification EXERCISE C: Classifications in diagrams and paragraphs EXERCISE D: Classification according to defining characteristics. GRAMMAR We can express the purpose for which something is done by using a to -infinitive. Instead of a to-infinitive we may use in order to + infinitive or so as to + infinitive to express purpose. SUMMARY CHECK 主要 参考资料 备注