Unit+5+Using+language+Evaluate+chemical+farming+and+organic+farming+教案 高中英語(yǔ)人教版（2019）選擇性必修第一冊(cè)

2019新人教高中英語(yǔ)選擇性必修一Unit5UsingLanguageEvaluatechemicalfarmingandorganicfarming公開(kāi)課教案Teachingaims:Enablestudentstoknowthedifferencebetweenchemicalfarmingandorganicfarming.Knowthestructureofanargumentativeessayandthewritingskillsofanargumentativeessay,suchasillustrating,givingexamplesormakingcontrasts.Writeanargumentativeessayusingwhattheywilllearninthisperiod.Teachingkeypoints:Analysethedifferencebetweenchemicalfarmingandorganicfarming.Analysethestructureandthewritingskillsoftheargumentativeessay.Teachingdifficultpoints:Analysethestructureandthewritingskillsoftheargumentativeessay.Writeanargumentativeessayusingwhattheywilllearninthisperiod.Teachingprocedures:StepLead-inActivity1Makingpredictions(1)Lookatthetitleofthepassageandtrytoguesswhatwillbetalkedaboutinthepassage.(2)Ifyouwereaskedtowritethepassageunderthistitle,whatisyourstructure?Suggestedanswers:(1)Whatthetextwilltalkaboutwillinclude:thedefinitionsofbothkindsoffarmingandtheadvantagesanddisadvantagesofeach.(2)Mystructuremaybelikethis:Activity2PictureguessingHereare6pictures.Trytofindoutwhichonesareaboutchemicalfarmingandwhichareorganicaccordingtoyourbackgroundknowledge.Suggestedanswers:Picture1organicfarming;Picture2chemicalfarming;Picture3organicfarming;Picture4organicfarming;Picture5organicfarming;Picture6chemicalfarming.StepⅡTestourpredictionsReadthetextquicklyandsilentlyandtrytofindwhatisthemainideaofeachparagraph.Andthendrawthemapofthestructure.Para.1_____________________________________________Para.2_____________________________________________Para.3_____________________________________________Para.4_____________________________________________Para.5_____________________________________________Suggestedanswers:Para.1Chemicalfarminghelpsfightcropdiseaseandincreaseproduction.(advantage)Para.2Threedisadvantagesofchemicalfarming.(disadvantages)Para.3Thedefinitionoforganicfarmingandoneofitsadvantages.(advantage)Para.4Otherdifferentmethodsoforganicfarmingandtheiradvantages.(advantages)Para.5Thedisadvantageoforganicfarmingandshowtheattitudeofthewritertothereaders.(disadvantage&attitude)Thereforethestructureofthepassageis:(soourguessisquiteright.)StepⅢReadfordetails：Readthetextcarefullyandcompletethetable.（紅色為學(xué)生填寫(xiě)部分）ChemicalfarmingadvantageAgreatwaytofightcropdiseaseandincreaseproduction.disadvantages1.Killnotonlyharmfulbacteriaandinsectsbutalsohelpfulones.2.Affectnotonlythecropsbutalsotheanimalsandhumanswhodigestthem.3.Cropsarelackinginnutrition.Organicfarmingadvantages1.Thesoilisrichinminerals.2.Keeptheair,soil,waterandcropsfreeofchemicals.3.Avoiddamagetotheenvironmentortopeople’shealth.disadvantageNowherenearabletomeettheneed.Thewriter’sattitudeHe/Sheisfororganicfarming.Butthereisstillalongwaytofindasuitablesolution.StepⅣReadfortheorganizationandlanguageActivity1Readthetextcarefullyagainandfindoutthetransitionalwordsandthinkabouttheirfunctions.Suggestedanswers:Thetransitionalwords:forexample,notonly...butalso,inaddition,inturn,infact,asfor,but,and,aswell.Activity2Discussthefollowingquestions.(1)Whatotheradvantagesanddisadvantagesoforganicfarmingdidtheauthornotlist?

(2)Whichkindoffarmingdoyoulike?Andwhy?Suggestedanswers:(1)Advantages:Organicfoodismorenutritiousandhasmuchflavour.Farmerscangetmoremoneyoutoforganicfarming.Disadvantages:highercostofproducingfood;greatereffortrequiredtofarm.(2)Ilikeorganicfarming.Becauseorganicfoodismoredeliciousandmorehealthy.StepⅤWritingWriteanargumentativeessaygivingyouropiniononchemicalororganicfarming.Activity1Completetheoutlinebelow.（紅色部分為學(xué)生填寫(xiě)部分）Topicsentence:Inmyopinion,__________farmingispreferableto__________farmingbecause___________Point1:Chemicalfarmingharmstheenvironment.(Detail):Chemicalpesticidesarenotfoundinnature,andnormalnaturalprocessescannotgetridofthem.Point2：Chemicalfarmingharmsuspeople.(Detail):Weendupeatingplants,diaryproducts,eggs,andmeatthathavehighlevelsofpesticides.Point3:Organicfoodisgenerallymorenutritiousthanfoodgrownwithman-madechemicals.(Detail):Chemicalsarecommonlyusedinfarmingtogrowlargercropsmorequickly.Conclusion:Iwouldliketosuggestbuyingorganicfood.Suggestedanswers:Topicsentence:Inmyopinion,organicfarmingispreferabletochemicalfarmingbecausechemicalfarmingdoesharmtonotonlytheenvironmentbutalsopeopleandbecausechemicalfoodhaslessnutritionwhileorganicfoodismorenutritious.Activity2Useyouroutlinetowriteashortessaygivingyouropiniononthetopic,payingattentiontousingrighttransitionalwords.Activity3Exchangeyourdraftswithanotherpair.Usethischecklisttogivethemhelpfulfeedback.√Doesthewriterdoagoodjobofexpressinghis/heropinion?√Doeseachparagraphhaveonemainidea?√Doeseachparagraphhaveatleastonedetailtosupportitsmainidea?√Doesthewritersequencethepointsinlogicalorder?√Doesthewriterdoagoodjobpersuadingyoutoaccepthis/heropinion?Activity4Polishyourdraftandshareitwithyourpartner.Suggestedanswer:Inmyopinion,organicfarmingispreferabletochemicalfarmingbecauseofthebenefitstotheenvironmentandpeople,andbecauseorganicfoodismorenutritious.Tobeginwith,chemicalfarmingharmstheenvironment.Sincechemicalpesticidesarenotfoundinnature,andnormalnaturalprocessescannotgetridofthem.Instead,thechemicalstendtoaccumulateinthesoilandwater,andareabsorbedinthefoodchain,wheretheypoisonwildlifeanddomesticanimals.Thisaffectsusdirectly,becauseweendupeatingplants,dairyproducts,eggs,andmeatthathavehighlevelsofpesticides.Thinkaboutit:Thepurposeofthepesticidesistokill“pests”.Somethingthatcankillaninsectprobablyisnothealthyforapersontoeat.Whileitmaybetruethatthefoodweeatdoesnothaveenoughpesticideinittokillusimmediately,overtheyearsthispesticidemaycauseushealthproblemsorgiveusdiseasessuchascancer.Finally,organicfoodisgenerallymorenutritiousthanfoodgrownwithman-madechemicals.Therewasthecaseofwatermelonsliterallyexplodinginthefieldsbecausetheyhadbeengivenchemicalstomakethem