必修四Unit2using-language-公開課課件

ChemicalOrOrganicFarming?First,buyorselecttheseedsfromthestore.Second,weneedtoplow（犁田）orturnoverthesoil.Third,wesowtheseedsinthesoil.Finally,wecanharvestourgrain.

fertilizethesoiltoincreaseproductionofthe

crops

fertilizerfertilizerHowmanykindsoffertilizersdoyouknow?

chemicalfertilizers

natural

fertilizerschemicalfarmingorganicfarmingchemicalfertilizers

natural

fertilizersBetter？ReadingChemicalOrOrganicFarming?Part2Part1Para1.Para2.Para3.Para4.Long-termuseof___________fertilizerscancausedamageto_______________________.Skimthetext,trytogetthemain

ideaofeachparagraphFarmersandcustomersturnto_______________.__________causedbychemicalfertilizers.Othermethodstokeep_____________.chemicalthelandandpeople’shealthProblemsorganicfarming

thesoilfertile://ppthi-hoo.Questions1.Whyarechemicalfertilizerssopopularinfarmingtoday?2.Whatisorganicfarming?Becausetheyareagreatwaytostopcropdiseaseandincreaseproduction.Organicfarmingisfarmingwithoutusinganychemicals.

ReadPart1,trytofindtheproblemsandcausesofchemicalfarming,thenfilltheblanks.

ProblemsCausesChemicalfarmingdamage_________affect______,______and_________.leadto______and____________.fruit,vegetablesandotherfoodhaveless________.bykilling_________________________________________bystayinginthegroundandundergroundwaterbybuildingup____________________________bygrowingtoofasttheland

cropsanimalshumans

cancerotherillnessnutrition

thehelpfulbacteriaandpestsaswellasharmfulones.

inpeople’sbodiesovertime

ReadPart2,trytofindthemethodsandadvantagesoforganicfarmingaswellasthewaytokeepthesoilfertile,thenfilltheblanks.Organicfarming

Methodsusenaturalwaste_______________________makethesoil_____________________________________change__________________________________put________________backinto_______,making______________________plantdifferent_____withdifferentlengthsof_____Usedifferentlevels

ofsoilplant_______________andthenleaveit________________preventwindorwaterfromcarryingawaythesoil

andbecomeanaturalfertilizer

richerinmineralsandsomorefertile

fromanimalsasfertilizer

thekindofcropineachfieldeveryfewyears

importantminerals

thesoil

itreadyforothercropscropsroots

grassbetweencropsintheground

Advantages

Themethodstokeepthesoilfertile：

usingnaturalwastefromanimalsasfertilizer.changingthekindofcropineachfield.plantingcropstousedifferentlevelsofsoil.plantinggrassbetweencropstoprevent…Thesamegoal:____________________________________________________________________________________________togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealth.1234

Inrecentdays,scientistshavediscoveredthatusing________fertilizersforalongtimecan_________________thelandandalsopeople'shealth.Thereareseveral__________causedbychemicalfertilizers.Theydamagetheland,stayinthewaterforalongtimewhichcan________inpeople’sbodiesand____________manyillnesses.chemicalproblemscausedamagetobuildupSummaryleadto________farmingisbecomingmorepopularwithsomefarmers.Organicfarmingdoesnotuseanychemicalsand_________keepingthesoilrich.Thisalso______theairandcrops___________chemicals.Therearemanyorganicfarming_________formakingthelandhealthyandproductive.Allofthesemethodstrytoproducegoodfoodandtokeeptheenvironmentandpeople’shealth.keepmethodsfocusonOrganicfreefrom://ppthi-hoo.ListeningWhatisthemaintopicoftheconversation?

Thepossiblebadeffectsofchemicalfertilizersonthefruitandvegetablesthatweeattoday.

://ppthi-hoo.TrueorFalsePaulthinksthatCarrieisnottellinghimthetruth.Usingchemicalfertilizersalwaysmakesvegetablesemptyinside.Today’sfruitisnotashealthyforpeopleasfruitfiftyyearsago.Eatingmorevegetablesmightnotalwaysb