人教版英语必修4unit2Using language市公开课一等奖省名师优质课赛课一等奖课件

人教课标版高一必修4Unit2英语课件ReadingonP14Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorganicfarming?ORGANICFARMING

Organicfarmingissimplyfarmingwithoutusinganychemicals.1.Whyarechemicalfertilizerssopopularinfarmingtoday?I.Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.Comprehending2.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.3.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.4.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.II.Readthetextagainandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________productionChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutritionOrganicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoalOrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevelsInwhatconditiondoyouthinkgreenfoodgrow?Theadvantagesofgreenfooddirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizersclean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizersMainideaofthepassageChemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.ORGANICFARMINGStructureofthetextIusingchemicalfertilizersforalongtimecanhurtthelandandalsopeople’shealthIIProblemcausedbychemicalfertilizers1.Damagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones2.Leadtocancerorotherillness.3.Foodgrownwithchemicalfertilizerslookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.ⅢOrganicfarmingisbecomingmorepopularwithsomefarmersandmanycustomersafterthesediscoveriescameout.IVOthermethodstokeepthesoilfertile.ProjectPersuadethefarmersinourcountytogrowthecropsbyorganicfarmingwiththeknowledgelearnt.Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcrops?……Languagepoints1.leadto使用方法[寓词于境]阅读以下句子，注意leadto意思和使用方法。1.Hiscarelessnessledtotheaccident.2.Thistestisobviouslybadbecauseitleads toincorrectlearning.3.Toomuchworkandtoolittlerestoften leadstoillness.[自我归纳]leadto意为“_________________”,后多跟名词或代词。造成、造成(后果)[联想]resultin引发(某种结果)、使取得(某种结果)、结果……。如：Theaccidentresultedintwodeaths.resultfrom由……造成、因……而产生。如：Sicknesssometimesresultsfromeatingtoomuch.[即学即练]用leadto适当形式完成句子。1.Studentsshouldalwaysrememberthathard workisthemainwaywhich______success.2.Thebadweather_____aterribleaccidenta fewdaysago.ledtoleadsto2.focus使用方法[猜一猜]依据语境推断focus在以下句子中含义,并从a-d中找出与每句话中focus相符合英文释义。1.Thefocusofthemeetingchangedfrompopulationgrowthtotheeducationofwomen.2.Bringtheobjectintofocusifyouwantaclearphotograph.3.Shetriedtofocushermindonherwork.4.SheturnedthecameraandfocusedonMartin’sface.a.thething,person,situation,etc.thatpeoplepayspecialattentiontob.apointordistanceatwhichtheoutlineofanobjectisclearlyseenbytheeyeorthroughalensc.topointacameraatsomething,andchangethecontrolsslightlysothatyoucanseethatthingclearlyd.togivespecialattentiontooneparticularpersonorthing,ortomakepeopledothisc

abd[归纳总结]focus作名词,意为“焦点、中心点”;作动词,意为“集中、聚焦”,常组成短语focuson,意为“集中(注意力、精力等)于”。[即学即练]翻译以下句子。1.Becauseofhisstrangeclothes,he immediatelybecamethefocusof attentionwhenheenteredtheoffice.因为他奇装异服,所以一走进办公室他便成了大家注意焦点。2.Focusyourcameraonthosetrees.3.I’msotiredthatIcan’tfocusonanythingtoday.把摄影机焦点集中在那些树上。今天我太累了,精神集中不起来。3.keep…freefrom“远离”或“防止”keepfreefromemotionalreactions

防止激动反应

keepfreefromrestrictions

防止受到限制

4.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.[分析]①本句结构比较复杂。其主干结构为:主句(Cropsputimportantmineralsbackintothesoil)+状语(makingitreadyforcrops)。②状语中又包含“make+it+形容词”结构和由that引导定语从句(thatneedrichandfertilesoil)。5.Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear’scrop.[分析]①本句主干结构是一个简单句,其结构是:主语(farmers)+谓语(prefer)+并列宾语(planting...+leaving...)。②其中betweencrops和intheground作地点状语。③两个宾语后面又分别带有一个不定式作目状语（topreventwindorwaterfromcarryingawaythesoil和tobecomeanaturalfertilizerforthenextyear’scrop）。ExercisesI.依据以下各句句意及所给单词首字母或汉语提醒，写出所缺单词正确形式。1.Thenewmodelwillgointop________nextyear.2.Becauseofhispoorn_______,hehasgrownweakerandweaker.nutrition production3.Thosecountriesarerichin_______(矿物)resources.4.Newscientificd_________arebeingmadeeveryday.5.Thegroupproducesamonthly________(摘要)oftheirresearch.summarymineraldiscoveriesII.用适当介词填空。