必修四 UNIT 2 Using language

ReadingonP14,Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.,Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.,Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorganicfarming?,ORGANICFARMINGOrganicfarmingissimplyfarmingwithoutusinganychemicals.,1.Whyarechemicalfertilizerssopopularinfarmingtoday?,I.Readthepassageandanswerthefollowingquestions.,Theyareagreatwaytostopcropdiseaseandincreaseproduction.,Comprehending,2.Whatproblemscanbecausedbyusingchemicalfertilizers?,Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeopleshealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.,3.Whatisorganicfarming?,Organicfarmingmeansgrowingcropswithoutusinganychemicals.,4.Whatisthemainreasonforusingorganicfarmingmethods?,Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeopleshealth.,II.Readthetextandfillintheblanks.,production,bacteriaandpests,nutrition,Goal,grass,natural,thekindofcrop,differentlevels,Inwhatconditiondoyouthinkgreenfoodgrow?,Theadvantagesofgreenfood,dirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizers,clean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizers,Mainideaofthepassage,Chemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.,Long-termuseofchemicalfertilizerscancausedamagetothelandandpeopleshealth.,Farmersandcustomersturntoorganicfarming.,Othermethodstokeepthesoilfertile.,Problemscausedbychemicalfertilizers.,P1.,P2.,P3.,P4.,ORGANICFARMING,Structureofthetext,IusingchemicalfertilizersforalongtimecanhurtthelandandalsopeopleshealthIIProblemcausedbychemicalfertilizers,1.Damagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones,2.Leadtocancerorotherillness.,3.Foodgrownwithchemicalfertilizerslookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.,Organicfarmingisbecomingmorepopularwithsomefarmersandmanycustomersafterthesediscoveriescameout.IVOthermethodstokeepthesoilfertile.,Dothejob,Persuadethefarmersinourcountytogrowthecropsbyorganicfarmingwiththeknowledgelearnt.,Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcrops?,Languagepoints,1.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.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.focus用法猜一猜根据语境推断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,归纳总结focus作名词,意为“焦点、中心点”;作动词,意为“集中、聚焦”,常构成短语focuson,意为“集中(注意力、精力等)于”。即学即练翻译下列句子。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.keepfreefrom“远离”或“避免”,keepfreefromemotionalreactions避免激动的反应keepfreefromrestrictions避免受到限制,4.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)。,5.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）。,Exercises,I.根据下列各句句意及所给单词的首字母或汉语提示，写出所缺单词的正确形式。1.Thenewmodelwillgointop_nextyear.2.Becauseofhispoorn_,hehasgrownweakerandweaker.,nutrition,production,3.Thosecountriesarerichin_(矿物的)resources.4.Newscientificd_arebeingmadeeveryday.5.Thegroupproducesamonthly_(摘要)oftheirresearch.,summary,mineral,discoveries,II.用适当的介词填空。1.Costshavebeenreduced_20%overthepastyear.2.Youcanfocusyourtelescope_thatdistanttelevisiontower.3.IhopeIhaventkeptyou_yourwork.,by,on,from,4.Hemadenocomments_whatIsaidatthemeeting.5.“Greenfood”isgrownaway_industrialareasanddirtywatersupplies.,from,on/about,III.根据