人教版必修四英语第二单元Using-Language精品课件.ppt

UsingLanguage,B4U2,Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.,Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.,Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorganicfarming?,ORGANICFARMINGOrganicfarmingissimplyfarmingwithoutusinganychemicals.,1.Whyarechemicalfertilizerssopopularinfarmingtoday?,Readthepassageandanswerthefollowingquestions.,Theyareagreatwaytostopcropdiseaseandincreaseproduction.,2.Whatisorganicfarming?,Organicfarmingmeansgrowingcropswithoutusinganychemicals.,3.Whatisthemainreasonforusingorganicfarmingmethods?,Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeopleshealth.,Readthepassagecarefullyandfillintheblanks.,production,bacteriaandpests,nutrition,Goal,grass,natural,thekindofcrop,differentlevels,Project,Persuadefarmerstogrowthecropsbyorganicfarmingwiththeknowledgelearnt.,Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcrops?.,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.Studentsshouldalwaysrememberthathardworkisthemainwaywhich_success.2.Thebadweather_aterribleaccidentafewdaysago.,ledto,leadsto,2.Theyfocusonkeepingtheirsoilrichandfreeofdisease.focus用法根据语境推断focus在下列句子中的含义,并从a-d中找出与每句话中的focus相符合的英文释义。,1.Thefocusofthemeetingchangedfrompopulationgrowthtotheeducationofwomen.2.Bringtheobjectintofocusifyouwantaclearphotograph.3.Shetriedtofocushermindonherwork.4.SheturnedthecameraandfocusedonMartinsface.a.thething,person,situation,etc.thatpeoplepayspecialattentiontob.apointordistanceatwhichtheoutlineofanobjectisclearlyseenbytheeyeorthroughalensc.topointacameraatsomething,andchangethecontrolsslightlysothatyoucanseethatthingclearlyd.togivespecialattentiontooneparticularpersonorthing,ortomakepeopledothis,c,a,b,d,focusn.意为“焦点、中心点”;v.意为“集中、聚焦”常构成短语focuson,意为“集中(注意力、精力等)于”。翻译下列句子。1.Becauseofhisstrangeclothes,heimmediatelybecamethefocusofattentionwhenheenteredtheoffice.,由于他的奇装异服,所以一走进办公室他便成了大家注意的焦点。,2.Focusyourcameraonthosetrees.3.ImsotiredthatIcantfocusonanythingtoday.,把照相机的焦点集中在那些树上。今天我太累了,精神集中不起来。,3.Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.keepfreefrom“远离”或“避免”,keepfreefromemotionalreactions避免激动的反应keepfreefromrestrictions避免受到限制,4.reducev.减少,降低e.g.公司尽力通过减少花销来提高利润。Thecompanytriestoincreaseprofitsby_.今年我们已经减少了业务开支。We_expensesthisyear.,reducingcosts,havereduced,5.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.,分析本句结构比较复杂。其主干结构为:主句(Cropsputimportantmineralsbackintothesoil)+状语(makingitreadyforcrops)。状语中又包含“make+it+形容词”结构和由that引导的定语从句(thatneedrichandfertilesoil)。,6.Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyearscrop.分析本句的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.)。,其中betweencrops和intheground作地点状语。两个宾语后面又分别带有一个不定式作目的状语（topreventwindorwaterfromcarryingawaythesoil和tobecomeanaturalfertilizerforthenextyearscrop）。,Expressions,1.化肥2.对造成损害3.洗掉某物4