人教版必修四英语第二单元Using-Language精品课件.ppt

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1、UsingLanguageB4U2Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorgan

2、icfarming?ORGANICFARMINGOrganicfarmingissimplyfarmingwithoutusinganychemicals.1.Whyarechemicalfertilizerssopopularinfarmingtoday?Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.2.Whatisorganicfarming

3、?Organicfarmingmeansgrowingcropswithoutusinganychemicals.3.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.Readthepassagecarefullyandfillintheb

4、lanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________productionChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrow

5、stoofasttobefullofmuch________.bacteriaandpestsnutritionOrganicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoalOrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Usi

6、ng_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevelsProjectPersuadefarmerstogrowthecropsbyorganicfarmingwiththeknowledgelearnt.Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcr

7、ops?...1.Manyofthesechemicalscanleadtocancer...leadto用法[寓词于境]阅读下列句子，注意leadto的意思和用法。1)Hiscarelessnessledtotheaccident.2)Thistestisobviouslybadbecauseitleadstoincorrectlearning.3)Toomuchworkandtoolittlerestoftenleadstoillness.Languagepoints[自我归纳]leadto意

8、为“_________________”,后多跟名词或代词。导致、造成(后果)[联想]resultin引起(某种结果)、使获得(某种成果)、结果……。如：Theaccidentresultedintwodeaths.resultfrom由……造成、因……而产生。如：Sicknesssometimesresultsfromeatingtoomuch.[即学即练]用leadto的适当形式完成句子。1.Studentsshouldalwaysrememberthathardworkist