1、READING FOR READING FOR WRITINGWRITINGU N I T 5By the end of this class,you will be able to:1.work out the content,structure and language features of an expository essay.2.co-construct an argumentative essay by completing the outline with topic-related ideas and useful expressions in the expository
2、essay.3.write an argumentative essay to give your own opinion on chemical farming and organic farming.Learning ObjectivesWarm-upWarm-upPA R T 1What do you know about the two farming methods?chemical/conventional farmingorganic farmingScan the passage What is chemical farming?What is organic farming?
3、Chemical farming is farming using _.Organic farming is farming_.chemical pesticides and artificial fertilizerswithout using chemicalsPre-writingPre-writingPA R T 2 Read for the structure:an expository essay小标题Title Subject 1:chemical farmingSubject 2:organic farmingConclusionRead for the main ideasM
4、atch the main ideas(A-D)below with the paragraphs.ParagraphMain idea1-2345BCADA.What organic farming is B.Why man-made chemicals are still used in farming C.Organic methods for producing rich soil D.The problems with chemical farmingReading for useful expressionsWhat are the benefits and problems of
5、 chemical farming?ParagraphMain IdeaDetail1-2 BenefitsProblems_ Pesticides can kill helpful _ Some pesticides have been _because of the _.Crops grown with chemical fertilizers usually _to be full of _.The problems with chemical farmingfight crop diseases and increase productionbacteria and insectspr
6、ohibiteddamage they causedgrow too fast nutritiousRead for useful expressionsPara.3-4Paragraph Main IdeaDetail3What organic farming is Many organic farmers use_as fertilizer.4Organic methods for producing rich soil They often_grown in each field.They also plant crops that use_of the soil to help kee
7、p it rich.change the kind of cropdifferent depths natural waste from animalsRead for detailsWhat is one problem of organic farming?Some people would prefer to stop the use of man-made chemicals in agriculture entirely.What keeps them from doing so is the fact that chemical farming serves the high de
8、mand for food around the world.Organic farming is nowhere near able to meet that need.Therefore,there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.ParagraphMain IdeaDetail5Why man-made ch
9、emicals are still used in farming Organic farming is nowhere near able to meet the high _.demand for food around the worldWhile-While-writingwritingPA R T 3Write an argumentative essay giving your opinion on chemical or organic farming.Para.1Para.2-4Para.5language language pointspointsPA R T 41.chem
10、ical pesticides2.artificial fertiliser3.be in use in sth.4.long-term use5.over time6.organic farming1.化学农药2.人工肥料3.在.应用中4.长期使用5.随着时间推移6.有机耕种Para 1 phrasesChemical pesticides and artificial fertilisers _(be)in widespread use in _(farm)since the middle of the 20th century.When they were first introduce
11、d,many farmers welcomed them_ a great way _(fight)crop disease and increase production.Over time,_,what some scientists have found is _ their long-term use can sometimes harm both the land _ peoples health.have beenashoweverthatandfarmingto fightPara 1 Para 11.damage the land2.harmful bacteria and i
12、nsects3.underground water sources4.essential minerals5.in turn6.cause damage to sb.7.be rich in8.as well 9.as for1.破环土地2.有害的细菌和昆虫3.地下水资源4.必需矿物质，主要矿物5.相应地，依次，轮流6.对某人造成伤害7.富含.8.也9.关于，至于Para 2 phrasesFor example,pesticides can damage the land by _(kill)not only harmful bacteria and insects,_also helpfu
13、l ones.In addition,these chemicals can stay in the soil and underground water sources for a long time.This affects the crops _(grow)on the land and,in turn,the animals and humans _ digest them.Many people worry _ these chemicals may make them ill and even cause cancer.In fact,some pesticides _DDT ha
14、ve been _(prohibite)in most countries because of the damage they cause_people and the environment.As for chemical fertilisers,crops _(grow)with them usually grow too fast _(be)rich in nutrition.They may look beautiful on the outside,but inside there is usually more water than _(essence)minerals,and
15、they often have _(little)flavour as well.killingbutwholiketoto belessPara 2grownthatprohibitedgrownessentialprohibit v.prohibit sb.from doingprohibition n.essence n.本质；实质本质；实质in essence 从本质上讲从本质上讲 对对.很重要很重要be essential toIt is essential(for sb)to do sthIt is essential that.(should)do This affects th
16、e crops grown on the land and,in turn,the animals and humans who digest them.in turn 相应地；转而；依次；轮流1.This in turn attracts more users and advertisers,and so on.2.We will examine each of these methods in turn.【归纳拓展】take turns to do/in doing sth.轮流做某事 Its ones turn to do sth.轮到某人做某事了。by turns 轮流地，交替地 in
17、 return 作为回报1.switch to2.turn to3.local grocery4.keep their soil rich5.free of disease6.through natural means7.keep A free of B1.转向2.转向3.当地的百货店4.保持土壤肥沃5.免受病害6.通过自然方法7.使A摆脱BPara 3 phrasesAs_ alternative,some farmers have _(switch)to organic farming,and many customers have turned _ organic food_ they
18、shop at the local grocery.Organic farming is simply farming_ using any chemicals.Organic farmers focus on _(keep)their soil rich and free _disease through natural means.For example,many organic farmers use natural waste from animals _fertiliser.This makes the soil in their fields _(rich)in minerals.
19、It also keeps the air,soil,water,_ crops free of chemicals.anwhenofaswithoutandPara 3switchedtokeepingricher.的替代品的替代品an alternative to别无选择只能做某事别无选择只能做某事have no alternative/choice to do sth替代能源替代能源alternative energy alternative lifestyle/values非传统的生活方式非传统的生活方式/价值观价值观“不得不做某事不得不做某事”的其他表达：的其他表达：cant but
20、 do sth;cant choose/help but doby all means 当然行；可以当然行；可以by no means绝不绝不by means of借助借助.的手段；依靠的手段；依靠.的方法的方法Organic farmers focus on keeping their soil rich and free of disease through natural means.focus on 关注，聚焦于focus ones attention/mind on 1.The discussion focuses on the death rate in traffic accid
21、ents.2.I regret not having focused my mind on my study.3.When someone delivers a speech,you must focus on understanding his main ideas.fix ones attention on 把某人的注意力集中于concentrate on 集中（注意力、精力）于pay attention to 注意put ones heart into 全神贯注于1.grow corn or wheat2.grow beans3.the next batch of crops4.plan
22、t diverse crops5.grounds surface6.avoid damage to1.种玉米或小麦2.种豆3.下一批谷物4.种植多样化的作物5.土地表面6.避免.的伤害Para 4 phrasesOrganic farmers also use many other _(method)to produce rich soil.They often change the kind of crop _(grow)in each field every year._instance,they may grow corn _wheat in a field one year,and t
23、hen grow beans there the next.Why different crops are grown _(be)because they put important minerals back into the ground,_(make)it ready for the next batch of crops.Organic farmers also plant diverse crops that use different _(depth)of soil to help keep it rich.For example peanuts grow _ the ground
24、s surface,but many other vegetables put down deep_(root).The goal of using different organic farming methods _(be)to grow good food while avoiding damage to the environment or _ peoples health.methodsFororismakingdepthsonrootsistoPara 4grownroot 根；根茎根；根茎;根源根源1.We need to get to the root of the probl
25、em before we can solve it.2.Since that day,a dream has taken root in my heart.3.No country,no happiness.Everyone must be rooted in the soil of the motherland.问题的根源问题的根源在心里扎根在心里扎根植根于植根于 adj.highwidelongstrongbroadn.v.heightheightenwidthwidenlengthlengthenstrengthstrengthenbroaden1.would prefer to do
26、2.man-made chemicals3.keep.from doing4.serves the high demand5.nowhere near6.meet the need7.there is still a long way to do8.sufficient food 1.宁愿做.2.人造化学品3.阻止.做某事4.满足高需求5.完全没有，远不及6.满足需求7.做某事还有很长的路要走8.充足的食物Para 5 phrasesSome people would prefer _(stop)the use of man-made chemicals in agriculture _(en
27、tire)._ keeps them from _(do)so is the fact _ chemical farming serves the high demand for food _ the world.Organic farming is nowhere near able _(meet)that need.Therefore,there is still a long way _(find)a suitable _(solve)that puts sufficient food on the dinner table while _(keep)people and the env
28、ironment as healthy _possible.to stopentirelyWhatthatto meetsolutionkeepingasPara 5aroundto finddoingWhat keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.同位语从句（1）可以跟同位语从句的名词通常有 news，idea，fact，promise，question，doubt,thought,hope,message,suggestion,words（消息）,possibility 等。（2）引导同位语从句的词常有从属连词：that,whether;连接代词：who,whom,whose,what,which;连接副词：when,where,why,how（注：if，which 不能引导同位语从句）1.I heard the news that our team had won.2.He must answer the question whether he agrees to it or not.
