浙江省天台县平桥第二中学高中英语 Unit 2 using language课件 新人教版必修4.ppt

chemicalororganicfarming greenfood organicfood chemicalororganicfarming 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 secondreading tips theusageofseveraladverbsmeansclearandreasonableconnectionbetweenparts readparagraph2andfindouttheproblemscausedbyusingchemicalfertilizers therearethreeproblems first theycandamage aswellas theyalsostayinthe and inaddition growtoofastto tips connectives 过渡词 andtransitionalphrases 过渡词 fordevelopment first second finally lastbutnotleast etc readparagraph3 4 whataretheadvantagesoforganicfarming thefarmersfocusonkeepingtheirsoilrichandfreeofdiseaseandkeepingtheair soil waterandcropsfreefromchemicals tips severalphrasescanbeused themethodstokeepthesoilfertile1usingnaturalwastefromanimalsasfertilizer 2changingthekindofcropineachfield 3plantingcropstousedifferentlevelsofsoil4plantinggrassbetweencropstoprevent thesamegoal togrowgoodfoodandtoavoiddamagingtheenvironmentorpeople shealth tips infinitive to isusedtoexpressthepurpose 1 suchaswheatorcornthatneedrichandfertilesoil 2 plantingpeanutsthatusetheground ssurfacefollowedbyvegetablesthatputdowndeeproots readthefollowingsentence andfindwhattheyhaveincommon tips clausesmakethepassagelogical 逻辑的 andbeautiful nounclauses attributiveclause thetwosentencesbothincludeattibutiveclause para1 anewdiscoveryofscientists para2 severalproblemscausedbyusingchemicalfertilizers para3 theadvantagesofusingorganicfarming para4 somemethodstokeepthesoilfertile thestructureofthispassage para1topic para2problems para3advantages para4severalmethods illustration 阐明 comparisonconclusion thetypeofthearticleis 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 discussionandpractice plasticorclothbags illustration 阐明 comparisonconclusion para1 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 para1topicpara2problemspara3advantagespara4severalmethods illustration 阐明 comparisonconclusion thetypeofthearticleis exposition 说明文 thestructureofthispassage zxxkoverthepasthalfcentury 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 suseclothbagsino