【课件】Unit+5+Using+Language+课件-人教版（2019）选择性必修第一册.pptx

Unit 5 WORKING THE LANDUsing LanguageEvaluate chemical farming and organic farmingWORKING THE LAND Using LanguageChemical Versus Organic FarmingLi Ziqi is expert at planting.She has a magic yard full of plants,such as vegetables,fruits and flowers.She also encounters some problems when tending to the plants in the yard.pesticideinsecticidal lamp(杀虫灯)natural enemy(天敌)compost(堆肥堆肥)chemical/artificial fertilizermanure(粪肥粪肥)fertilizerFertilize the soilrid the soil of the weedkill off the pestpesticidechemical/artificial fertilizerinsecticidal lamp(杀虫灯)natural enemy compost(堆肥)manure(粪肥)VersusWhat is to be included in the passage with the title?A.What organic farming isB.Why man-made chemicals are still used in farming C.Organic methods for producing rich soil D.The problems with chemical farmingPara.1-2Para.3Para.4Para.5chemical pesticidesartificial fertilisersin widespread use in farmingThe middle of the 20th century many farmers welcomed fight crop diseaseincrease productionlong-term use can sometimes harm both the land and peoples health.Some scientists have foundNowPara1Para1Para1Para 1stay in the and pesticidebacteria&insectsharmful+helpfulaffect the the animals and humanswho digest may make them ill and cause cancerPara 2soil underground watercropsdestroyin turn转而转而less nutritionless essential mineralsless flavourprohibited2.keep the air,soil,water,and crops _Q1.Whats organic farming?Q2.What are the benefits of oragnic farming?Organic farming is simply farming without using any chemicals.Organic farmers focus on keeping their soil rich and free of disease through _.benefits1.make the soil _ Para 3e.g.use natural waste from animals as fertilisernatural meansricher in mineralsfree of chemicalsAs an alternative?less nutritionless essential mineralsless flavourParagraph4?produce rich soilPara 41._ _(grow)in each field2._ _(use)different depths of soil organic farming methodschange the kind of cropplant diverse cropsgrownusingPara 5Q1:WhWhy areare man-made chemicals still used in man-made chemicals still used in farmingfarming?Q2:Whats the authors attitude towards chemical farming?objective客观的客观的list advantages and disadvantagesraise 2questions from the paragraphActivity 4:Read for StructurePara.1-2Para.3-4Para.5Problems(gerneral+specific)ConclusionSolutionsdisadvantagesadvantages and disadvantagesadvantagesWhat other disadvantages of organic farming can you What other disadvantages of organic farming can you think of?think of?Farmingadvantagedisadvantagechemical farmingorganic farming Activity 4:Summarize the advantages and disadvantages 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 .What other disadvantages of organic farming can you What other disadvantages of organic farming can you think of?think of?high priceFarmingadvantagedisadvantagechemical farmingorganic farmingActivity 4:Summarize the advantages and disadvantages 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.fail to meet the high demand for food around the world2.require higher cost of producing food and greater effort to farm