【课件】Unit+5+Using+Language+Writing+课件人教版（2019）选择性必修第一册.pptx

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1、U5 Working the LandEvaluate chemical farming and organic farmingReading for Writing1.chemical2.flavor3.fertilizer4.nutrition5.organic6.pesticide7.widespread8.bacterium9.in turn10.digest11.essential12.mineral1、adj.化学的化学的2、n.味道味道3、n.肥料肥料4、n.营养营养5、adj.有机的有机的6、n.杀虫剂杀虫剂7、adj.普遍的普遍的8、n.细菌（细菌（bacteria）9、相应

2、地，依次、相应地，依次10、v.消化；领会消化；领会n.摘要摘要11、adj.完全必要的；极其重要的完全必要的；极其重要的12、n.矿物质矿物质Lead inWhat makes plants grow better?Chemical fertilizersNatural waste from animalsChemical Farming Organic Farming （体育，法律上）（体育，法律上）对抗；抗；（比（比较较两种不同想法、两种不同想法、选择选择等）与等）与相相对对，与，与相比相比化化学学耕耕作作与与有有机机耕耕作作Versus1.Why did many farmers we

3、lcome the introduction of chemical farming?Many farmers welcomed them as a great way to fight crop diseases and increase production.2.What concerns many people about the use of pesticides?Their long-term use can sometimes harm both the land and peoples health.Paragraph 13.What is one problem with th

4、e use of chemical fertilisers?Crops grown with them usually grow too fast to be rich in nutrition.Paragraph 24.How is organic farming different from chemical farming?Organic farming is simply farming without using any chemicals.Organic farmers focus on keeping their soil rich and free of diseases th

5、rough natural means.Paragraph 35.Why do organic farmers change the kind of crop grown in a field every year?Different crops are grown because they put important minerals back into the ground,making it ready for the next batch of crops.Paragraph 46.What is the goal of using organic farming methods?Th

6、e goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.Paragraph 4A.What organic farming isB.Why man-made chemicals are still used in farming C.Organic methods for producing rich soil D.The problems with chemical farmingPa

7、ra.1-2Para.3Para.4Para.5extensive readingTitle Text type:Exposition farming chemicalPart 1:(Para 1&2)_ farmingorganicPart 2:(Para 3&4)Part 3:(Para 5)_conclusionextensive reading1.What is chemical farming?What is organic farming?Chemical Versus Organic FarmingOrganic farming is simply farming _.Chemi

8、cal farming is farming with _,especially _ and _.while chemicalschemical pesticidesartificial fertilizerswithout chemicalsParaMain IdeaDetail1-2Pesticidescankillhelpful .Somepesticideshavebeen because of the .Cropsgrownwithchemicalfertilisersusually to be full of .3Manyorganicfarmersuse as fertilise

9、r.DAbacteria and insectsprohibiteddamage they causegrow too fastnutritionnatural waste fromanimals benefitsproblemsParaMain IdeaDetail4 Theyoften grown in each field .Theyalsoplantcropsthatuse of the soil to help keep it rich.5Organicfarmingisnowherenearabletomeetthehigh .CBchange the kind of crop e

10、very yeardifferent depthsdemand for food around the worldhow it keep the soil richFarmingadvantagedisadvantagechemical farmingorganic farming List the advantages and disadvantages of each farming1.fight crop disease effectively2.increase production1.keep the soil rich2.keep the environment and crops

11、 free of chemicals3.produce crops with much nutrition and flavor1.harm the environment and health2.produce crops with less nutrition and flavor1.produce food with low output .Summarize _(化学农药和人工肥料)have been in widespread use in farming since the middle of the 20th century.When they were first introd

12、uced,many farmers welcomed them as a great way to _ _(抵御作物病害、增加产量).Over time,however,what some scientists have found is that _(长期使用它们有时会危害土地和人类健康).Chemical pesticides and artificial fertilizers disease and increase productiontheir long-term use can sometimes harm both the land and peoples healthPara

13、 1fight cropRead for useful expressionsFor example,pesticides can damage the land by _(杀死有害细菌和昆虫的同时，也杀死有益的细菌和昆虫).In addition,these chemicals can stay in the soil and underground water sources for a long time.This affects the crops grown on the land and,_(继而影响消化这些作物的人畜).Many people worry that these c

14、hemicals may _(致病，甚至引发癌症).In fact,some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment.As for chemical fertilizers,crops grown with them usually _(生长过快而营养不足).They may look beautiful on the outside,but inside there is usually m

15、ore water than _(必需矿物质),and they often _(口感较差)as well.killing not only harmful bacteriain turn,the animals and humans who digest themmake them ill and even causegrow too fast to be rich in nutritionessential mineralshave less flavorPara 2and insects,but also helpful onescancer_(作为一种替代方法),some farmer

16、s have switched to _(有机耕作),and many customers have turned to _(有机食品)when they shop at the local grocery.Organic farming is simply farming _ _(不使用任何化学品).Organic farmers focus on _ (通过天然的方法保持土壤肥沃，没有病害).For example,many organic farmers use natural waste from animals as fertilizer.This _(使农田土壤富含矿物质).It

17、also keeps the air,soil,water,and crops free of chemicals.As an alternativeorganic farmingorganic foodwithout using anykeeping their soil rich and free of disease through natural meansmakes the soil in their fields richer in mineralsPara 3chemicalsOrganic farmers also use many other methods to produ

18、ce rich soil.They often _(每年更换每块农田种植的作物种类).For instance,they may grow corn or wheat in a field one year,and then grow beans there the next.Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.Organic farmers also _(种植土壤

19、深度要求不同的多样化作物)to help keep it rich.For example,peanuts grow on the grounds surface,but many other vegetables put down deep roots.The goal of using different organic farming methods is to _(生产优质食物，同时避免损害环境和人类健康).change the kind of crop grown in each field every yearplant diverse crops that use differe

20、ntgrow good food while avoiding damage to the environment or to peoples health.Para 4depths of soil Some people would prefer to stop the use of man-made chemicals in agriculture entirely.What keeps them from doing so is the fact that chemical farming _(满足了全世界对事物的高要求).Organic farming is nowhere near

21、able to meet that need.Therefore,_(想要找到一个合适的解决方案，使人类和环境尽可能保持健康，又让人们有足够的食物可吃，还有很长的路要走).serves the high demand for food around the worldsuitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.Para 5there is still a long way to fin

22、d aRead for traditional words Chemical pesticides and artificial fertilisers have been in widespread use in farming since the middle of the 20th century.When they were first introduced,many farmers welcomed them as a great way to fight crop disease and increase production.Over time,_,what some scien

23、tists have found is that their long-term use can sometimes harm _ the land _ peoples health._,pesticides can damage the land by killing _ harmful bacteria and insects,_ helpful ones._,these chemicals can stay in the soil and underground water sources for a long time.This affects the crops grown on t

24、he land and,in turn,the animals and humans who digest them.howeverbothandFor examplenot onlybut alsoIn addition Many people worry that these chemicals may make them ill and even cause cancer._,some pesticides like DDT have been prohibited in most countries because of the damage they cause to people

25、and the environment._ chemical fertilisers,crops grown with them usually grow too fast to be rich in nutrition.They may look beautiful on the outside,_ inside there is usually more water than essential minerals,_ they often have less flavour _._,some farmers have switched to organic farming,and many

26、 customers have turned to organic food when they shop at the local grocery.Organic farming is simply farming without using any chemicals.In factAs forbutandas wellAs an alternative Organic farmers focus on keeping their soil rich and free of disease through natural means._,many organic farmers use n

27、atural waste from animals as fertiliser.This makes the soil in their fields richer in minerals.It _ keeps the air,soil,water,and crops free of chemicals.Organic farmers _ use many other methods to produce rich soil.They often change the kind of crop grown in each field every year._,they may grow cor

28、n or wheat in a field one year,and then grow beans there the next._ _ they put important minerals back into the ground,making it ready for the next batch of crops.For examplealsoFor instancealsoWhy different crops aregrown is because Organic farmers _ plant diverse crops that use different depths of

29、 soil to help keep it rich._,peanuts grow on the grounds surface,_ many other vegetables put down deep roots.The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.Some people would prefer to stop the use of man-made che

30、micals in agriculture entirely.What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.Organic farming is nowhere near able to meet that need._,there is still a long way to find a suitable solution that puts sufficient food on the dinner table

31、 while keeping people and the environment as healthy as possible.For examplealsobutTherefore however,but,on the contrary,instead,on one hand on the other hand for example,for instance,in fact,such as,take for example bothand,not onlybut also,in addition,and,also,as well,whats more,besides,furthermore,moreover,whats worsewhyis because,therefore,for this reason,thus,consequently,as a ressultas for,as an alternativetransitional words contrast对比对比 illustrate解释解释add补充补充cause and effect因果因果introduce a new topic