Working the land电子课件3.pptVIP

Unit 2 Working the land Section Ⅲ Using Language 课件（人教版必修4，课标通用）;Ⅰ.阅读理解 Using chemical fertilizers is popular because it can stop crop disease and increase__1__，but long-term use of these fertilizers can cause damage to the land and even to peoples health.Organic farming is to grow crops with natural but not__2__fertilizers.Organic farmers __3__keeping their soil rich and __4__disease.They prefer using natural waste from animals as fertilizers.They think this makes the soil in their fields __5__ minerals and so more __6__. ;Organic farmers also use many other methods to keep the soil fertile.They often change the kind of crop in each field__7__，or plant crops to use different__8__ of soil，or plant grass between crops to prevent wind or water from __9__ the soil.However，these methods have the same goal：to grow good food and avoid damaging the __10__ or peoples health. 答案　1.production　2.chemical　3.focus on　4.free of/from　5.richer in　6.fertile　7.every few years　8.levels 9．carrying away　10.environment;Ⅱ.教材研读 一、重点单词熟记 1．________(adj.)化学的；关于化学的→________(n.)化学 2．________(n.)生产；制造→________(v.)生产 3．________(vt.)发现→________(n.)发现；发觉 4．________(vt.)减少；减缩→________(n.)减少 5．________(n.)营养；滋养；食物 6．________(vt.)画底线标出；强调 7．________(n.)总结；摘要；概要 8．________(n.)评论；议论(vi.vt.)表达意见；作出评论;答案　1.chemical；duction；produce 3．discover；discovery　4.reduce；reduction　5.nutrition 6．ment;二、重点短语探究 1．build________ 逐渐增强；建立；开发 2．lead________ 导致；造成(后果) 3．focus________ 集中(注意力、精力等)于 4．keep...free________ 使……免受(影响、伤害等)； 使……不含(有害物) 5．cause damage________ 对……造成损害 6．________ addition 此外；另外 答案　1.up　2.to　3.on　4.from/of　5.to　6.in;三、教材佳句背诵 1．Recently，however，scientists___________that longterm use of these fertilizers can cause damage to the land and，even more dangerous，to peoples health. 然而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的是，会对人们的健康造成危害。 2．With these discoveries，some farmers and many customers __________________organic farming. 由于这些发现，一些农民和很多消费者开始转向有机耕作。 ;3．A healthy soil________disease and helps crops