Unit 5working the landReading for writing1.chemical2.flavor3.fertilizer4.nutrition5.organic6.pesticide7.widespread8.bacterium9.in turn10.digest11.essential12.mineral1、adj.化学的化学的2、n.味道味道3、n.肥料肥料4、n.营养营养5、adj.有机的有机的6、n.杀虫剂杀虫剂7、adj.普遍的普遍的8、n.细菌（细菌（bacteria）9、相应地，依次、相应地，依次10、v.消化；领会消化；领会n.摘要摘要11、adj.完全必要的；极其重要的完全必要的；极其重要的12、n.矿物质矿物质添加添加标题添加添加标题Warm upImagine now you are a farmer who has a lot of fields.One day,you work in the land and find there are many pests and weeds among the crops.What would you do?添加添加标题Warm upAnother day,you find your crops growing slowly,what would you do?normal lack of mineralsLead inWhat makes plants grow better?Chemical fertilizersNatural waste from animals添加添加标题Critical thinkingWhat will happen if we overuse the pesticides and chemical fertilisers?PART ONEReading tasksChemical Farming Organic Farming （体育，法律上）（体育，法律上）对抗；抗；（比（比较较两种不同想法、两种不同想法、选择选择等）与等）与相相对对，与，与相比相比化化学学耕耕作作与与有有机机耕耕作作Versus添加添加标题添加添加标题While-reading1.Read the passage and answer the questions on page 56.2.Read the passage again and complete the chart on page 56(or on work sheet).While-reading1.Why did many farmers welcome the introduction of chemical farming?2.What concerns many people about the use of pesticides?3.What is one problem with the use of chemical fertilisers?4.How is organic farming different from chemical farming?5.Why do organic farmers change the kind of crop grown in a field every year?6.What is the goal of using organic farming methods?Do you think it can be reached?Why or why not?Because they see it as a great way to fight crop disease and increase production.It harms the land and peoples health.Killing both good and bad bacteria and insects.It doesnt use any chemicals.To produce rich soil.To grow good food while avoiding damage to the environment or to peoples health.添加添加标题添加添加标题While-readingDACBbacteria and insectsprohibiteddamage they causegrow too fastnutritionnatural waste from animalschange the kind of cropevery yeardifferent depthsdemand for food around the worldPART TWOWriting tasksFarmingadvantagedisadvantagechemical farmingorganic farming List the advantages and disadvantages of each farming1.fight crop disease effectively2.increase production1.keep the soil rich2.keep the environment and crops free of chemicals3.produce crops with much nutrition and flavor1.harm the environment and health2.produce crops with less nutrition and flavor1.produce food with low output .Summarize _(化学农药和人工肥料)have been in widespread use in farming since the middle of the 20th century.When they were first introduced,many farmers welcomed them as a great way to _ _(抵御作物病害、增加产量).Over time,however,what some scientists have found is that _(长期使用它们有时会危害土地和人类健康).Chemical pesticides and artificial fertilizers disease and increase productiontheir long-term use can sometimes harm both the land and peoples healthPara 1fight cropRead for useful expressionsFor example,pesticides can damage the land by _(杀死有害细菌和昆虫的同时，也杀死有益的细菌和昆虫).In addition,these chemicals can stay in the soil and underground water sources for a long time.This affects the crops grown on the land and,_(继而影响消化这些作物的人畜).Many people worry that these chemicals may _(致病，甚至引发癌症).In fact,some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment.As for chemical fertilizers,crops grown with them usually _(生长过快而营养不足).They may look beautiful on the outside,but inside there is usually more water than _(必需矿物质),and they often _(口感较差)as well.killing not only harmful bacteriain turn,the animals and humans who digest themmake them ill and even causegrow too fast to be rich in nutritionessential mineralshave less flavorPara 2and insects,but also helpful onescancer_(作为一种替代方法),some farmers have switched to _(有机耕作),and many customers have turned to _(有机食品)when they shop at the local grocery.Organic farming is simply farming _ _(不使用任何化学品).Organic farmers focus on _ (通过天然的方法保持土壤肥沃，没有病害).For example,many organic farmers use natural waste from animals as fertilizer.This _(使农田土壤富含矿物质).It also keeps the air,soil,water,and crops free of chemicals.As an alternativeorganic farmingorganic foodwithout using anykeeping their soil rich and free of disease through natural meansmakes the soil in their fields richer in mineralsPara 3chemicalsOrganic farmers also use many other methods to produce rich soil.They often _(每年更换每块农田种植的作物种类).For instance,they may grow corn or wheat in a field one year,and then grow beans there the next.Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.Organic farmers also _(种植土壤深度要求不同的多样化作物)to help keep it rich.For example,peanuts grow on the grounds surface,but many other vegetables put down deep roots.The goal of using different organic farming methods is to _(生产优质食物，同时避免损害环境和人类健康).change the kind of crop grown in each field every yearplant diverse crops that use differentgrow good food while avoiding damage to the environ。