Unit5 Using Language 公开课（ppt课件）-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、Evaluate chemical farming and organic farming1.Enable students to know the difference between chemical farming and organic farming.2.To know the structure of an argumentative essay.3.To know the writing skills of an argumentative essay,such as illustrating,giving examples or making contrast.4.To wri

2、te an argumentative essay using what they will learn in this period.Step 1 Task 1 Making predictions1.Look at the title of the passage and try to guess what will be talked in the passage.2.If you were asked to write the passage under this title,what is your structure?What the text will talk about wi

3、ll include:the definitions of both kinds of farming and the advantages and disadvantages of each.Chemical farmingVs Organic farmingChemical farmingorganic farmingadvantagesdisadvantagesadvantagesdisadvantagesMy choice/attitudeThe structure of the textorganic farmingchemical farmingorganic farmingorg

4、anic farmingchemical farmingorganic farmingStep II Test our predictionRead the text quickly and silently and try to find what is the main idea of each paragraph.And then draw the map of the structure.Para.1_Para.2 _Para.3_Para.4 _Para.5 _Chemical farming help fight crop disease and increase producti

5、on.(advantage)Three disadvantages of chemical farming.(disadvantages)The definition of organic farming and one of its advantages.(advantage)Other different methods of organic farming and their advantages.(advantages)The disadvantage of organic farming and show to the readers the attitude of the writ

6、er.(disadvantage&attitude)Step III Reading for detailsRead the text carefully and complete the table.Chemical farmingadvantageA great way to _.disadvantagesKill not only _ but also_.Affect not only _but also _.Crops are lacking in _.Organic farmingadvantagesThe soil is rich in _.Keep _free of chemic

7、als.Avoid damage to _.disadvantageNowhere near able to _.The writers attitudeHe/She is for _.But there is still a long way to _.fight crop disease and increase productionharmful bacteria and insects helpful onesthe cropsthe animals and humans who digest themnutritionmineralsair,soil,water and cropst

8、he environment or to peoples healthmeet the needorganic farmingfind a suitable solutionStep IV Reading for the organization and languageTask 1 Read the text carefully again and find out the transitional words and think about their functions.Task 2 Discuss the following questions.1.What other advanta

9、ges and disadvantages of organic farming did the author not list?2.Which kind of farming do you like?And why?For example;not only.but also;in addition;in turn;in fact;as for;.,but.;.,and.as well.Advantages:organic food are more nutritious and have much flavour.Farmers can get more money out of organ

10、ic farming.Disadvantages:higher cost of producing food;greater effort required to farm.I like organic farming.Because organic food are more delicious and more healthy.Step V Writing an argumentative essay giving your opinion on chemical or organic farming.Task 1 Complete the outline below.Topic sent

11、ence:In my opinion,_farming is preferable to _farming because _Point1_(Detail)_Point2_(Detail)_Point3_(Detail)_Conclusion:_organicchemicalchemical farming does harm to not only the environment but also peopleChemical farming harms the environmentChemical pesticides are not fund in nature,and normal

12、natural processes cannot get rid of themChemical farming harms us peopleWe end up eating plants,diary products,eggs,and meat that have high levels of pesticidesOrganic food is generally more nutritious than food grown with man-made chemicalsChemicals are commonly used in farming to grow larger crops

13、 more quickly.I would like to suggest buying organic food.Task 2 Use your outline to write a short essay giving your opinion on the topic,paying attention to using right transitional words.Task 3 Exchange posters with another pair.Use this checklist to give them helpful feedback.Does the writer do a

14、 good job of expressing his/her opinion?Does each paragraph have one main idea?Does each paragraph have at one detail to support its main idea?Does the writer sequence the points in logical order?Does the writer do gcod job persuading you to accept his/her opinion?Task 4 Polish your drafts and share

15、 with your partners.Language Pointsorganicwidespreaddigestessentialmineralalternativegroceryinstancedepthrootentirelyaspect相应地;转而;依次;轮流随着时间的推移例如;比如集中于防止做对没有影响进行研究建立执行把和分开1.in turn相应地相应地;转而转而;依次依次;轮流轮流digest vt.&vi.消化消化vt.领会领会;领悟领悟【教材原句】【教材原句】This affects the crops grown on the land and,in turn,the a

16、nimals and humans who digest them.这影响到种在土地上的庄稼这影响到种在土地上的庄稼,进而影进而影响动物和消化这些作物的人。响动物和消化这些作物的人。【词汇精讲【词汇精讲1】in turn相应地相应地;转而转而;依次依次;轮流轮流She asked the same question of everyone in turn.她依次向每一个人问同样的问题。她依次向每一个人问同样的问题。In the city squares the neon lights flashed in turn.在城市广场上在城市广场上,霓虹灯依次闪烁。霓虹灯依次闪烁。【词汇拓展】【词汇拓

17、展】During the summer holidays,the teachers were on duty by turns.暑假期间暑假期间,老师们轮流值班。老师们轮流值班。When it is my turn,I realized why the process was moving so slow.当轮到我的时候当轮到我的时候,我明白进程为什么这么慢了。我明白进程为什么这么慢了。【词汇精讲【词汇精讲2】digest vt.&vi.消化消化vt.领会领会;领悟领悟He has to avoid fat because his body cant digest it.他不得不避免吃脂肪他不

18、得不避免吃脂肪,因为他的身体无法消化它。因为他的身体无法消化它。I need some time to digest information.我需要一些时间来理解信息。我需要一些时间来理解信息。【词汇拓展】【词汇拓展】No liquids are served with meals because they interfere with digestion.上饭菜时不要同时上汤水或饮品上饭菜时不要同时上汤水或饮品,因为这会因为这会2.essential adj.完全必要的完全必要的;极其重要的极其重要的【教材原句】【教材原句】They may look beautiful on the out

19、side,but inside there is usually more water than essential minerals,and they often have less flavour as well.它们可能外表看起来很漂亮它们可能外表看起来很漂亮,但里面通常有更多的水但里面通常有更多的水,而不而不是必要的矿物质是必要的矿物质,而且它们的味道通常也更差。而且它们的味道通常也更差。【词汇精讲】【词汇精讲】essential adj.完全必要的完全必要的;极其重要的极其重要的Even in small companies,computers are an essential to

20、ol.即使在小公司里即使在小公司里,计算机也是必不可少的工具。计算机也是必不可少的工具。French and German are deemed essential.法语和德语被认为是必不可少的。法语和德语被认为是必不可少的。【词汇拓展】It is essential that we(should)deal with the problem.我们很有必要处理这个问题。It is essential to know where the problem lies.有必要知道问题在哪里。3.alternative n.可供选择的事物可供选择的事物adj.可供替代的可供替代的;非传统的非传统的【教材原

21、句】【教材原句】As an alternative,some farmers have switched to organic farming,and many customers have turned to organic food when they shop at the local grocery.作为一种选择作为一种选择,一些农民转向了有机农业一些农民转向了有机农业,许多顾客在许多顾客在当地商店购物时转向了有机食品。当地商店购物时转向了有机食品。【词汇精讲】【词汇精讲】alternative n.可供选择的事物可供选择的事物adj.可供替代的可供替代的;非传统非传统的的He gav

22、e in only at the last moment because he had no alternative.他只是在最后一刻因为没有选择才做了让步。他只是在最后一刻因为没有选择才做了让步。We will have to rely more on alternative energy,such as solar and wind power.我们将不得不更多地利用可代替的资源,比如太阳能和风能。【词汇拓展】If he wants to go to Hong Kong tonight,he has no alternative but to go by air.如果他今晚想去香港,除了坐

23、飞机外别无选择。4.instance n.例子;实例;事例【教材原句】For instance,they may grow corn or wheat in a field one year,and then grow beans there the next.【词汇精讲】instance n.例子;实例;事例There have been several instances of violence at the school.在学校有几起暴力事例。I can cite quite a few instances to illustrate this.我可以举出好几个例子来说明这件事情。【词汇

24、拓展】She has mastered several foreign languages,for instance,French.她精通几种语言,例如法语。1.Therefore,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.因此因此,要找到一个合适的解决方案还有很长的路要走要找到一个合适的解决方案还有很长的路要走

25、,该该方案可以在餐桌上提供足够的食物方案可以在餐桌上提供足够的食物,同时又要尽可能保持人和环境的健康。同时又要尽可能保持人和环境的健康。【句式剖析】本句是一个复合句。【句式剖析】本句是一个复合句。there is still a long way.是主句是主句,that puts.是定语从句是定语从句,while keeping是省略句。是省略句。as.as possible尽可能尽可能。Please respond to me as quickly as possible.请尽快给我回信。请尽快给我回信。He desired that his book be read by as many

26、people as possible.他希望有尽可能多的人读他的书。他希望有尽可能多的人读他的书。2.In fact,some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment.事实上事实上,在在大多数国家大多数国家,像滴滴涕这样的杀虫剂已经被禁止像滴滴涕这样的杀虫剂已经被禁止,因为它们对人和环境造成因为它们对人和环境造成了损害。了损害。【句式剖析】【句式剖析】because of因为因为,是介词短语是

27、介词短语,常用作原因状语常用作原因状语,后面跟名后面跟名词或代词作宾语。词或代词作宾语。My brother didnt pass the driving test exam because of his laziness.由于我弟弟的懒惰由于我弟弟的懒惰,他他没有没有通过这次驾驶考试。通过这次驾驶考试。The sports meeting has been put off because of the bad weather.由于天气不好由于天气不好,运动会被推迟了。运动会被推迟了。because是连词是连词,其后接句子其后接句子;because of 是复合介词是复合介词,其后接名词、代其

28、后接名词、代词、动词的词、动词的-ing、what 从句等从句等,它在句中不用作表语。它在句中不用作表语。The teacher got angry because of what we had done in class.老师由于我们课上做的事情生气了。老师由于我们课上做的事情生气了。We decided not to climb the mountains because it was raining heavily.正下着暴雨正下着暴雨,所以我们决定不去爬山了。所以我们决定不去爬山了。1.Review what we have learned and put up the poster in your classroom or in a public place.2.Appreciate your classmates good works and try to learn from them.