Unit 5 Using language (2) （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 farming Unit 5 Working the Land Using Language(2)Learning aims1.Integrate and describe the differences between chemical and organic farming and their respective advantages and disadvantages.2.Analyze and judge the authors writing techniques,learn to master the m

2、ain discourse features of argumentation.3.Express their views on chemical farming or organic farming in written form in appropriate language.Farming proceduresploughing sowing irrigatingfertilizing活动一：感知与注意活动一：感知与注意What kind of fertilizers do farmers use?Chemical fertilizers Natural waste from anima

3、ls活动一：感知与注意活动一：感知与注意chemical strawberries organic strawberries活动一：感知与注意活动一：感知与注意Chemical apples organic apples 活动一：感知与注意活动一：感知与注意chemical grapes organic grapes活动一：感知与注意活动一：感知与注意chemical bananas organic bananas活动一：感知与注意活动一：感知与注意Organic FarmingTo protect the crop,farmers have to kill off the hamful _.

4、pestsChemical fertilizershybrid cornseedless watermelonAChemical fertilizersBNatural fertilizersNatural waste from animals and dead plantsNow,which one do you prefer?AB safe food green food organic food safe or not?Which tomatoes do you prefer?5 yuan/kg30 yuan/kgNormal tomatoesOrganic tomatoesChemic

5、al or Organic Farming?Chemical or organic farming?Read the text“Chemical versus organic farming”and then answer the following questions on page 56.Questions活动活动二二：获取与梳理获取与梳理1.Why did many farmers welcome the introduction of chemical farming?2.What concerns many people about the use of pesticides?3.W

6、hat is one problem with the use of chemical fertilisers?Because it is a great way to fight crop disease and increase production.Pesticides can damage the land by killing not only harmful bacteria and insects but also helpful ones.In addition,these chemicals can stay in the soil and underground water

7、 sources for a long time,which affects the crops grown on the land and animals and humans who digest them.Crops grown with chemical fertilisers usually grow too fast to be rich in nutrition.Read the text“Chemical versus organic farming”and then answer the following questions on page 56.Questions活动活动

8、二二：获取与梳理获取与梳理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?Organic farming is simply farming without using any che

9、micals.Because different kinds of crops put important minerals back into the ground,making it ready again for the next batch of crops.The goal of using organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.活动活动三三：概括与整合概括与整合（Match and Complete）1.Ma

10、tch the main ideas(A-D)below with the paragraphs.Then complete the sentences in the tables.ParagraphMain IdeaDetail 1-2 Pesticides can kill helpful Some pesticides have been because of Crops grown with chemical fertilisers usually to be full of 3Many organic farmers use as fertiliser.4 They often gr

11、own in each field They also plant crops that use of the soil to help keep it rich.5 Organic farming is nowhere near able to meet the highThe problems with chemical farmingWhat organic farming isOrganic methods for producing rich soilWhy man-made chemicals are still used in farmingbacteria and insect

12、s prohibitedthe damage they cause to people and the environmentgrow too fast nutritionnatural waste from animals change the kind of crop every year different depths need/demand for food around the world 活动活动四四：分析与判断分析与判断 (How does the author write?）1.The author uses some connectives when explaining

13、the details.Find and underline them.Then think about what they add to the text.Can you name more connectives according to different classes?Connectives in the text:and,also,but,while,however,for example,for instance,in addition,in fact,as for,because,therefore2.Find the subject clauses used in the t

14、ext and underline them.Then make your own sentences on the theme of chemical and organic farming.Over time,however,what some scientists have found is that their long-term use can sometimes harm both the land and peoples health.Why different crops are grown is because they put important minerals back

15、 into the ground,making it ready again 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.活动活动五五：内化与运用（：内化与运用（Write your argumentative essay）1.Discuss these questions in groups:Is the author of the passage for

16、or against organic farming?How do you know?What other disadvantages of chemical farming did the author not list？How might the following items be problems and how important are they for organic farming?What other disadvantages of organic farming can you think of?活动活动五五：内化与运用（：内化与运用（Write your argumen

17、tative essay）1.Decide topic and come up with main points to support your opinion,and then add at least one detail to support each main point.Complete the outline below.活动活动六六：批判与评价（：批判与评价（Critical Thinking）1.Use the checklist to help you review your partners draft.Exchange your draft with a partner.

18、Does the writer do a good job of expressing his/her opinion?Does each paragraph have one main idea?Does each paragraph have at least one detail to support its main idea?Does the writer sequence the points in a logical order？Are there any connectives in the essay?Does the writer use any subject claus

19、es？Does the writer do a good job persuading you to accept his/her opinion？Does the writer use correct grammar,punctuation,and spelling?2.Take your draft back and revise it.3.Share your essay with the rest of the class.HomewokWrite your argumentative essay giving your opinion on chemical or organic farming