【课件】Unit 5 Working the land Using language for writing 人教选择性必修第一册.pptx

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1、Reading for WritingChemical Versus Organic FarmingIt is fertilizer.What is the substance we put on the soilto make crops grow?Pre-readingAChemical fertilizersWhat kind of fertilizers do farmers use?BNatural fertilizersNatural waste from animals and dead plantsWhat kind of fertilizers do farmers use?

2、Its a product of organic farming.AIts a product of chemical farming.Borganic farmingchemical farmingorganic farmingorganic farmingchemical farmingorganic farmingMake a judgement:which is chemical farming and which is organic farming.BNow,which one do you prefer?A1.in my eyes/in my opinion from my po

3、int of view My view/opinion is that.2.Id prefer.Id rather.Read the text and then Match the main idea with each paragraph.C Organic methods for producing rich soil D The problems with chemical farmingPara.1-2Para.3Para.5 A What organic farming is B Why man-made chemicals are still used in farmingPara

4、.4Readcompletebacteria and insectsprohibiteddamage they usegrow too fastnutritionnatural waste from animalsevery yeardifferent depthsdemand for food around the worldReadcompletechange the kind of cropChemical pesticides and artificial fertilisers have been in widespread use in farming._Pesticides ca

5、n damage the land by killing only harmful bacteria and insects._Organic farmers focus on keeping their soil rich and free of disease through natural means._The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health._TTFTTrue

6、 or falsenot only.but also helpful onesWhat are the organic methods mentioned in the text?(Para3&4)1.use natural waste from animals as fertilizer.2.change the kind of crop grown in each field every year.3.plant diverse crops that use different depth of soil to keep it rich.use natural waste from ani

7、mals as fertilizerchange the kind of crop grown in each field every year.to put important minerals back into the ground to make the soil in the fields richer in mineralsplant diverse crops that use different depth of soil to keep it rich.to keep the soil richMethods Purposes Whats the goal of using

8、different organic Whats the goal of using different organic farming methods?farming methods?（Para.4Para.4）The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.Why cant we stop the use of man-made chemicals in agricultu

9、re entirely?A.Organic farming cost us a lot of money.B.Organic farming can meet peoples need.C.Chemical farming brought us huge profit.D.Chemical farming helps serve the need for food.Over time,however,what some scientists have found is that their long-term use can sometimes harm both the land and p

10、eoples health.然而，随着时间的推移，一些科学家发现长期使用农药和化肥会造成土地受损，对人们的健康造成危害。digest vt.消化；吸收 n.文摘；摘要 She couldnt digest food properly.她无法正常消化食物。They learn well but seem to need time to digest information.他们学得很好，但似乎需要时间来吃透这些知识。This affects the crops grown on the land and,in turn,the animals and humans who digest them

11、.这会影响到生长在土地上的农作物，反过来也会影响到消化它们的动物和人类。in turn 反过来；转而；轮流，依次 We look after him in turn.我们轮流照顾他。These behavioral changes may in turn be harmful to the health.这些行为的改变反过来可能对健康产生危害。As an alternative,some farmers have switched to organic farming,and many customers have turned to organic food when they shop a

12、t the local grocery.作为一种选择，一些农民已经转向有机农业，许多顾客在当地杂货店购买有机食品。alternative n.供替代的选择 adj.供选择的；选择性的 Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.句意：种植不同的作物是因为它们把重要的矿物质放回地下，使它为下一批作物再次做好准备。句子结构分析句子结构分析why引导的主语从句引导的主语从句bec

13、ause引导的表语从句引导的表语从句现在分词作状语现在分词作状语系动词系动词 Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.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.阻止他们这样做的原因是化学农业满足了世界各地对粮食的巨大需求。有机耕作完全不能满足那样的需求。