人教選擇性必修第一冊Unit5UsingLanguage(II)Evaluatechemicalfarmingandorganicfarming教學(xué)目

Lead-in視頻：Organicfarming12Tounderstandthedifferencesbetweenchemicalandorganicfarmingandtheiradvantagesanddisadvantages,analysethestructureandlearnwritingtechniquesofargumentativeessayTowriteanessaytoexpressyourviewsonchemicalfarmingororganicfarming目標(biāo)一：Tounderstandthedifferencesbetweenchemicalandorganicfarmingandtheiradvantagesanddisadvantages,analysethestructureandwritingtechniquesofargumentativeessayActivity1:Lookthroughpage55andpage56,findoutthenewwordsandphrases,readtheminpairs.Thenreadtogetherasawholeandsharetheirusage.organic,pesticide,widespread,bacterium,inturn,digest,essential,mineral,alternative,grocery,instance,forinstance,depth,root,entirelyActivity2:Lookatthetitleandthepicturesinthepassage,thinkaboutwhatitisabout.ChemicalVersusOrganicFarmingItisaboutchemicalandorganicfarming.Activity3:Readandmatchthemainideaswiththeparagraphs.Para.1—2

Para.3

Para.4

Para.5AWhatorganicfarming

BWhyman-madechemicalsarestillusedinfarming

COrganicmethodsforproducingrichsoil

DTheproblemswithchemicalfarming

Activity4:Readthetext,andthenanswerthequestions.1Whydidmanyfarmerswelcometheintroductionofchemicalfarming?2Whatconcernsmanypeopleabouttheuseofpesticides?3Whatisoneproblemwiththeuseofchemicalfertilizers?4Howisorganicfarmingdifferentfromchemicalfarming?5Whydoorganicfarmerschangethekindofcropgrowninafieldeveryyear?6Whatisthegoalofusingorganicfarmingmethods?Doyouthinkitcanbereached?Whyorwhynot?1Manyfarmerswelcomedthemasagreatwaytofightcropdiseasesandincreaseproduction.2Theirlong-termusecansometimesharmboththelandandpeople’shealth.3Cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.4Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoilrichandfreeofdiseasethroughnaturalmeans.5Differentcropsaregrownbecausetheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.6Differentcropsaregrownbecausetheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.Activity5:Readthepassageandcompletethesentencesinthetable.ParagraphMainideaDetail

1—2Theproblemswithchemicalfarming

?Pesticidescankillhelpful___________________.?Somepesticideshavebeen__________becauseofthe________________.?Cropsgrownwithchemicalfertilisersusually_____________tobefullof__________.3Whatorganicfarming?Manyorganicfarmersuse_______________________asfertiliser.bacteriaandinsectsprohibiteddamagetheycausegrowtoofastnutritionnaturalwastefromanimalsParagraphMainideaDetail

4Organicmethodsforproducingrichsoil?Theyoften_____________________grownineachfield___________.?Theyalsoplantcropsthatuse______________ofthesoiltohelpkeepitrich.

5Whyman-madechemicalsarestillusedinfarming?Organicfarmingisnowherenearabletomeetthehigh_________________________________.changethekindofcropeveryyeardifferentdepthsneed/demandforfoodaroundtheworldActivity6:Analysethestructureandwritingtechniquesofargumentativeessay.Task1:Readthetextcarefullyagainandfindoutthetransitionalwordsandthinkabouttheirfunctions.Forexample;notonly...butalso;inaddition;inturn;infact;asfor;...,but...;...,and...aswell.Task2:Analysethepassageandconcludethestructureofit.ChemicalfarmingVsOrganicfarmingChemicalfarmingOrganicfarming

advantagesdisadvantagesadvantagesdisadvantagesMychoice/attitude

目標(biāo)二:TowriteanessaytoexpressyourviewsonchemicalfarmingororganicfarmingActivity1:Writeanargumentativeessaygivingyouropiniononchemicalororganicfarming.1Discussthesequestionsingroups.?Istheauthorofthepassagefororagainstorganicfarming?Howdoyouknow??Whatotherdisadvantagesofchemicalfarmingdidtheauthornotlist??Howmightthefollowingitemsbeproblemsandhowimportantaretheyfororganicfarming?naturalanimalwasteusedasfertiliserhighercostofproducingfoodgreatereffortrequiredtofarm

?Whatotherdisadvantagesoforganicfarmingcanyouthinkof?2Decidewhetheryourgroupsupportschemicalfarmingororganicfarming.Comeupwiththreemainpointstosupportyouropinion,andthenaddatleastonedetailtosupporteachmainpoint.Completetheoutlinebelow.Topicsentence:Inmyopinion,_______farmingispreferableto____________farmingbecause______________Point1:_________________________________________(Detail)____________________________________Point2:_________________________________________(Detail)____________________________________Point3:_________________________________________(Detail)____________________________________Conclusion:______________________________________3Useyouroutlinetowriteashortessaygivingyouropiniononthetopic.Activity2:Exchangedraftswithapartner.1Usethechecklisttohelpyoureviewyourpartner’sdraft.√

Doesthewriterdoagoodjobofexpressinghis/heropinion?√

Doeseachparagraphhaveonemainidea?√

Doeseachparagraphhaveatleastonedetailtosupportitsmainidea?√

Doesthewritersequencethepointsinalogicalorder?√

Doesthewriterdoagoodjobpersuadingyoutoaccepthis/heropinion?2Takeyourdraftbackandreviseit.Shareyouressaywiththerestoftheclass.SampleWriting：Inmyopinion,organicfarmingispreferabletochemicalfarmingbecauseofthebenefitstotheenvironmentastopeople,andbecauseorganicfoodismorenutritious.Tobeginwith,chemicalfarmingharmstheenvironment.Sincechemicalpesticidesarenotfoundinnature,normalnaturalprocessescannotgetridofthem.Instead,thechemicalstendtoaccumulateinthesoilandwater,andareabsorbedinthefoodchain,wheretheypoisonwildlifeanddomesticanimals.Thisaffectsusdirectly,becauseweendupeatingplants,dairyproducts,eggs,andmeatthathavehighlevelsofpesticides.Thinkaboutit:Thepurposeofthepesticidesistokill“pests”,thatis,tokillinsects.Somethingthatcankillaninsectprobablyisnothealthyforapersontoeat.Whileitmaybetruethatthefoodweeatdoesnothaveenoughpesticideinittokillusimmediately,overtheyearsthispesticidemaycauseushealthproblemsorgiveusdiseasessuchascancer.Finally,organicfoodisgenerallymorenutritiousthanfoodgrownwithman-madechemicals.Ifyourememberafewyearsago,therewasthecaseofwatermelon