【課件】Unit 5 Using language 課件人教版(2019)高中英語選擇性必修第一冊

Unit5WORKINGTHELANDEvaluatechemicalfarmingandorganicfarmingTounderstandthedifferencesbetweenchemicalandorganicfarmingandtheiradvantagesanddisadvantages;Tolearnabouttheauthor'swritingtechniques;Tolearnaboutthestructureofargumentativeessay;Towriteanessaytoexpressyourviewsonchemicalfarmingororganicfarming.Whatcanbeusedtomakeplantsgrowbetter?Fertilizer.ChemicalfertilizersNaturalwastefromanimalsToprotectthecrops,farmershavetokillofftheharmfulpests.Whatisusedforkilling

pests,especiallyinsects?Pesticides.OrganicFarmingOrganicfarmingissimplyfarmingwithoutusinganychemicals.Chemicalororganicfarming?Whichtomatoesdoyouprefer?5yuan/kg30yuan/kgNormaltomatoesOrganictomatoesReadthetext“Chemicalversusorganicfarming”andthenanswerthefollowingquestions.1.Whydidmanyfarmerswelcometheintroductionofchemicalfarming?Manyfarmerswelcomedthemasagreatwaytofightcropdiseasesandincreaseproduction.2.Whatconcernsmanypeopleabouttheuseofpesticides?Theirlong-termusecansometimesharmboththelandandpeople’shealth.3.Whatisoneproblemwiththeuseofchemicalfertilisers?Cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.4.Howisorganicfarmingdifferentfromchemicalfarming?Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoilrichandfreeofdiseasesthroughnaturalmeans.5.Whydoorganicfarmerschangethekindofcropgrowninafieldeveryyear?Differentcropsaregrownbecausetheyputimportantmineralsbackintotheground,makingitreadyfornextbatchofcrops.6.Whatisthegoalofusingorganicfarmingmethods?Doyouthinkitcanbereached?Whyorwhynot?Thegoalofusingorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.Yes,Ithinkthisgoalcanbereached.Farmersworkedforcenturieswithoutusinganykindsofchemicalsandwithoutharmingtheenvironment,andthefoodtheyproducedwasjustfine.Matchthemainideas(A-D)belowwiththeparagraphs.AWhatorganicfarmingisBWhyman-madechemicalsarestillusedinfarmingCOrganicmethodsforproducingrichsoilDTheproblemswithchemicalfarmingPara.1-2Para.3Para.4Para.5DACBCompletethesentencesinthetables.Para.MainIdeaDetail1-2Pesticidescankillhelpful_________________Somepesticideshavebeen___________becauseofthe________________Cropsgrownwithchemicalfertilisersusually_____________tobe

fullof______________.bacteriaandinsectsprohibiteddamagetheycausegrowtoofastnutritionDPara.MainIdeaDetail3Manyorganicfarmersuse_______________________________asfertiliser.4

Theyoften____________________grownineachfield______________.Theyalsoplantcropsthatuse______________ofthesoiltohelp

keepitrich.5

Organicfarmingisnowherenearabletomeetthehigh_______________________________.fromanimalschangethekindofcropeveryyeardifferentdepthsdemandforfoodaroundtheworldnaturalwasteACBTheauthoruses“Benefits—Problems—Solutions”tointroducechemicalfarmingandorganicfarming.Finishthetableaccordingtothepassage.(Hereisjustanexample)FarmingBenefit

ProblemSolutionChemicalfarming

Organicfarmingfightcropdiseaseandincreaseproductionsometimesharmboththelandandpeople’shealthswitchtoorganicfarmingmakethesoilrich;keeptheair,soil,waterandcropsfreeofchemicalscannotmeettheneedstillalongwaytofindasuitablesolutionTheauthorusessometransitionsbetweenideas.FindsomeinPara.2andnametheirfunctions.TransitionwordsFunctionForexample,…Illustrating…,butalso…AddingmoreinformationandemphasisingInaddition,…AddingmoreinformationInturn,…SequencingInfact,…Illustrating/EmphasisingAsfor…Introducinganewtopic/thing…,but…Contrasting…,and…aswellAddingmoreinformationFindthesubjectclausesusedinthetextandunderlinethem.Thenmakeyourownsentencesonthethemeofchemicalandorganicfarming.①Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeople’shealth.②Whydifferentcropsaregrownisbecausetheyputimportantmineralsbackintotheground,makingitreadyagainforthenextbatchofcrops.現(xiàn)在分詞短語作結果狀語③Whatkeepsthemfromdoingsoisthefactthatchemicalfarmingservesthehighdemandforfoodaroundtheworld.同位語從句，對fact進行解釋說明，引導詞that沒有詞義，只起連接作用。1.digestvt.

1)tochangefoodthatyouhavejusteatenintosubstancesthatyourbodycanuse消化e.g.Mostbabiescandigestawiderangeoffoodeasily.2)tounderstandnewinformation,especiallywhenthereisalotofitoritisdifficulttounderstand理解，領悟e.g.Istruggledtodigestthenews.digestn.ashortpieceofwritingthatgivesthemostimportantfactsfromabook,reportetc摘要，概要，文摘e.g.Adigestoftheresearchfindingsisnowavailable.Thecompanypublishesamonthlydigestofitsactivities.2.alternativen.somethingyoucanchoosetodooruseinsteadofsomethingelse可供選擇的事物e.g.Isthereaviablealternativetothepresentsystem?Ihadnoalternativebuttoreporthimtothepolice.alternativeadj.(onlybeforenoun)differentfromtheoneyouhaveandcanbeusedinstead可替代的;另外的differentfromthetraditional非傳統(tǒng)的e.g.Haveyouanyalternativesuggestions?sourcesofalternativeenergy替代能源Discussthesequestionsingroups:?Istheauthorofthepassagefororagainstorganicfarming?Howdoyouknow??Whatotherdisadvantagesofchemicalfarmingdidtheauthornotlist?Writeanargumentativeessaygivingyouropiniononchemicalororganicfarming.?Howmightthefollowingitemsbeproblemsandhowimportantaretheyfororganicfarming??Whatotherdisadvantagesoforganicfarmingcanyouthinkof?naturalanimalwasteusedasfertiliserhighercostofproducingfoodgreatereffortrequiredtofarmDecidewhetheryourgroupsupportschemicalfarmingororganicfarming.Comeupwiththreemainpointstosupportyouropinion,andthenaddatleastonedetailtosupporteachmainpoint,completetheoutlinebelow.Useyouroutlinetowriteashortessaygivingyouropiniononthetopic.1.Usethechecklisttohelpyoureviewyourpartner’sdraft.Exchangeyourdraftwithapartner.√Doesthewriterdoagoodjobofexpressinghis/heropinion?√Doeseachparagraphhaveonemainidea?√Doeseachparagraphhaveatleastonedetailtosupportitsmainidea?√Doesthewritersequencethepointsinalogicalorder?√Doesthewriterdoagoodjobpersuadingyoutoaccepthis/heropinion?2.Takeyourdraftbackandreviseit.Shareyouressaywiththerestoftheclass.Inmyopinion,organicfarmingispreferabletochemicalfarmingbecauseofthebenefitstotheenvironmentandtopeople,andbecauseorganicfoodismorenutritious.Tobeginwith,chemicalfarmingharmstheenvironment.Sincechemicalpesticidesarenotfoundinnature,normalnaturalprocessescannotgetridofthem.Insteadthechemicalstendtoaccumulateinthesoilandwater,andareabsorbedinthefoodchain,wheretheypoisonwildlifeanddomesticanimals.Thisaffectsusdirectly,becauseweendupeatingplants,dairyproducts,eggs,andmeatthathavehighlevelsofpesticides.Thinkaboutit:Thepurposeofthepesticidesistokill“pests”,thatis,tokillinsects.Somethingthatcankillaninsectprobablyisnothealthyforapersontoeat.Whileitmaybetruethatthefoodweeatdoesnothaveenoughpesticideinittokillusimmediately,overtheyearsthispesticidemaycauseushealthproblemsorgiveusdiseasessuchascancer.Finally,organicfoodisgenerallymorenutritiousthanfoodgrownwithman-madechemicals.Ifyourememberafewyearsago,therewasthecaseofwatermelonsliterallyexplodinginthefieldsbecausetheyhadbeengivenchemicalstomakethemgrowfaster.Thereasonwhytheyexplodedwasthattheycontainedtoomuchwater,becausethefarmershadusedtoomanychemicalsandtheweatherwasunusuall