book4--unit2--using-lanuage-chemical-or-organic-fa

ChemicalOrOrganicFarming?greenfoodorganicfoodChemicalOrOrganicFarming?Firstreading:getthemainideaofeachparagraph.para1:Anewdiscoveryofscientists.para2:Severalproblemscausedbyusingchemicalfertilizers.para3:Theadvantagesofusingorganicfarming.para4:Somemethodstokeepthesoilfertile.1Whyarechemicalfertilizerssopopularinfarmingtoday?2Afterthelong-termuseofchemicalfertilizers,whathavescientistsfound?Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Long-termuseofchemicalfertilizerscancausedamagetothelandand,evenmoredangerous,topeople’shealth.Recently,however,therefore;meanwhile;anyhow;thus;otherwise;moreover;besidesetc.SecondreadingTips:theusageofseveraladverbsmeansclearandreasonableconnectionbetweenparts.Readparagraph2andfindouttheproblemscausedbyusingchemicalfertilizers.Therearethreeproblems.First,theycandamage…aswellas….Theyalsostayinthe…and….Inaddition,…growtoofastto….Tips:connectives（过渡词）andtransitionalphrases（过渡词）fordevelopmentfirst;second;finally;lastbutnotleast,etc.Readparagraph3-4Whataretheadvantagesoforganicfarming?Thefarmersfocusonkeepingtheirsoilrichandfreeofdiseaseandkeepingtheair,soil,waterandcropsfreefromchemicals.Tips:severalphrasescanbeused.Themethodstokeepthesoilfertile1usingnaturalwastefromanimalsasfertilizer.2changingthekindofcropineachfield.3plantingcropstousedifferentlevelsofsoil4plantinggrassbetweencropstoprevent…Thesamegoal:____________________________________________________________________________________________togrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.Tips:infinitive”to”isusedtoexpressthepurpose1…suchaswheatorcornthatneedrichandfertilesoil.2…plantingpeanutsthatusetheground’ssurfacefollowedbyvegetablesthatputdowndeeproots.Readthefollowingsentence,andfindwhattheyhaveincommon?Tips:clausesmakethepassagelogical（逻辑的）andbeautifulNounClauses&AttributiveClauseThetwosentencesbothincludeattibutiveclause.para1:Anewdiscoveryofscientists.para2:Severalproblemscausedbyusingchemicalfertilizers.para3:Theadvantagesofusingorganicfarming.para4:Somemethodstokeepthesoilfertile.ThestructureofthispassagePara1TopicPara2ProblemsPara3AdvantagesPara4Severalmethodsillustration（阐明）comparisonconclusionThetypeofthearticleis_____________exposition（说明文）请以“PLASTICORCLOTHBAGS?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。DiscussionandpracticePlasticOrClothBags?illustration（阐明）comparisonconclusionPara1:Para2:Para3:Para4:Haveabriefillustrationofthepresentsituation.Theproblemscausedbyusingplasticbags.Theadvanagesofusingclothbags.Conclusion.Thefollowingwordsmayhelpyou.Overthepasthalfcentury,…havebecomeverycommon….…welcomedthemasa…wayto….Recently,however,wehavebeenfindingthattheycancausedamageto…,even…,topeople’shealth.Homework:Finishthewriting.Overthepasthalfcentury,…havebecomeverycommon….…welcomedthemasa…wayto….Recently,however,wehavebeenfindingthattheycancausedamageto…,even…,topeople’shealth.Whataresomeoftheproblemscausedby…?First,…Withthesediscoveries,…arebeginningtoturnto….….Thefollowingwordsmayhelpyou.Para1TopicPara2ProblemsPara3AdvantagesPara4SeveralmethodsIllustration（阐明）comparisonconclusionThetypeofthearticleis_____________Exposition（说明文）ThestructureofthispassageOverthepasthalfcentury,plasticbagshavebecomeverycommoninourdailylife.Wewelcomedthemasaconvenientwaytocarrygoods.Recently,however,wehavebeenfindingthattheycancausedamagetotheenvironment,evenworse,topeople’shealth.Whataresomeoftheproblemscausedbyplasticbags?First,peopleoftenleaveplasticbagshereandthere,makingwhitepollution.Second,ittakesalongtime,morethan100years,tobeexact,tobreakup.Lastbutnotleast,whenheated,plasticbagscanproducesomethingharmful,whichcanbuildupinourbodyandeventuallyleadtocancerorotherillnesses.Withthesediscoveries,wearebeginningtoturntoclothbags.Theycanbeusedmanytimes.Peoplecansavealotofsourceinthisway.Itisalsoagoodideatomakesomebyourselves,whichisinteresting.Let’suseclothbagsinourdailylifeinsteadofplasticbags,notonlyfortheenvironmentprotection,butalsothesakeofourhealth.Whatdoyouthinkofthefarmingtoday?healthy?environment-friendly?natural?chemical?organic?green?transgenic?