Unit 5 Using Language Writing （ppt课件）-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、 Using Language:chemical versus organic farmingAn argumentative essay An argumentative essay is a genre of writing that requires the students to investigate a topic,collect,generate,and evaluate evidence,and establish a position on the topic in a concise manner.Para.1Para.1Para.2Para.2An argumentati

2、ve essay Your opinionSupporting point2Para.3Para.3Supporting point3Supporting point1IntroductionBodyConclusionSummaryTitleTitleDetailsDetailsDetails1.Why did many farmers welcome the introduction of chemical farming?2.What concerns many people about the use of pesticides?Self-study Self-study 3.What

3、 is one problem with the use of chemical fertilisers?4.How is organic farming different from chemical farming?5.Why do organic farmers change the kind of crop grown in a field every year?6.What is the goal of using organic farming methods?Do you think it can be reached?Why or why not?Peer Assistance

4、 Peer Assistance In groups,find the advantages and disadvantages of chemical farming the author listed.PresentationPresentationP1P2ConclusionConclusionAdvantages of Organic Farming Compared to chemical farming,organic farming enjoys its overwhelming superiority.The reasons are as follows.Firstly,org

5、anic food is healthier and safer as in organic farming,poisonous chemicals like pesticides are forbidden from being used on crops.Furthermore,organic farming is environmentally friendly.For instance,organic farmers use natural waste from animals as fertilizer,which is harmless to the environment.Las

6、tly,farmers can increase their income through organic farming.As people tend to pursue a green life,they are more likely to buy organic fruit and vegetables despite the high prices.With incomparable advantages,therefore,organic farming is expected to benefit more people in the future.P1 _(化学农药和人工肥料)

7、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 _(抵御作物病害、增加产量).Over time,however,what some scientists have found is that _(它们的长期使用有时会危害土地和人类健康).Chemical pesticides and artificial fertilizers fing

8、ht crop disease and increase productiontheir long-term use can sometimes harm both the Para 1CHEMICAL VERSUS ORGANIC FARMINGEvaluationEvaluation land and peoples healthRead for writing (useful expressions)P2 For example,pesticides can damage the land by _(不仅杀死有害细菌和昆虫，还杀死那些有益的).In addition,these chem

9、icals can stay in the _（土壤和地下水源中）for a long time.This affects the crops grown on the land and,_，（相应地）the animals and humans who _(消化这些作物).Many people worry that these chemicals may _(致病)and even _(引发癌症).In fact,some pesticides like DDT have been prohibited in most countries because of the damage the

10、y 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 more water than _(必需矿物质),and they often _(口感较差)as well.killing not only harmful bacteria and insects,but also help onessoil

11、and underground water sourcesin turnmake them illgrow too fast to be rich in nutrition essential mineralsPara 2CHEMICAL VERSUS ORGANIC FARMINGdigest themcause cancerhave less flavorRead for writing (useful expressions)Read for writing (useful expressions)_(作为一种替代方法),some farmers have switched to _(有

12、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 _(使土壤保持肥沃）and_(没有病害)through_ (天然的方法).For example,many organic farmers use_ _（天然的牲畜粪便）as fertilizer.This makes the soil in their fields_(更富含矿物质).I

13、t also keeps the air,soil,water,and crops free of chemicals.As an alternativeorganic farmingorganic foodwithout using anykeeping their soil rich richer in mineralsPara 3CHEMICAL VERSUS ORGANIC FARMINGchemicalsfree of disease natural means natural waste from animalsOrganic farmers also use many other

14、 methods to produce _（肥沃的土壤）.They often _(每年更换每块农田种植的作物种类).For instance,they may _（种植玉米或小麦）in a field one year,and then grow beans there the next.Why different crops are grown is because they _（把重要的矿物质重新放回土壤）,making it ready for the next batch of crops.Organic farmers also _（种植多样化的庄稼）that use differ

15、ent depth of soil to help keep it rich.For example,peanuts _（长在地表）,but many other vegetables_（扎根于土壤深处）.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 differentgrow good food while av

16、oiding damage to the environment or to peoples health.Para 4CHEMICAL VERSUS ORGANIC FARMINGgrow on the grounds surfacerich soilgrow corn or wheatput important minerals back into the groundput down deep rootsRead for writing(useful expressions)Some people would prefer to stop the use of man-made chem

17、icals in agriculture entirely.What keeps them from doing so is the fact that chemical farming _around the world(满足了对食物的高要求).Organic farming is nowhere near able to meet that need.Therefore,_（想要找到一个合适的解决方案仍然还有很长的路 走）t h a t p u t s s u ff i c i e n t f o o d o n t h e d i n n e r t a b l e _（同时让人和环境尽

18、可能的保持健康).serves the high demand for food suitable solution Para 5CHEMICAL VERSUS ORGANIC FARMINGthere is still a long way to find awhile keeping people and the environment as healthy as possible.Read for writing 2(discourse markers)Chemical pesticides and artificial fertilisers have been in widespre

19、ad 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 scientists have found is that their long-term use can sometimes harm _ the land _ peoples health._,pest

20、icides 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 the land and,in turn,the animals and humans who digest them.CHEMICAL VERSUS ORGANIC FARMINGhoweverb

21、othandFor examplenot onlybut alsoIn additionRead for writing 2(discourse markers)CHEMICAL VERSUS ORGANIC FARMINGMany 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

22、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

23、 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 alternativeRead for writing 2(discourse markers)CHEMICAL VERSUS ORGANIC FARMINGOrganic farmers focus on keeping their soil rich and

24、 free of disease through natural means._,many organic farmers use natural 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

25、the kind of crop grown in each field every year._,they may grow corn 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

26、Read for writing 2(discourse markers)CHEMICAL VERSUS ORGANIC FARMINGOrganic farmers _ plant diverse crops that use different depths of 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

27、 grow good food while avoiding damage to the environment or to peoples health.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 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 while keeping people and the environment as healthy as possible.For examplealsobutTherefore