Unit 5 Using Language Evaluate chemical farming and organic farming（ppt课件）-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、Pre-reading:predictionParagraph 5Read for the main ideaParagraph 1&2Paragraph 3Paragraph 4Paragraph 5Read for the structureParagraph 1&2Paragraph 3Paragraph 4Advantages Disadvantages 1.2.u harming the land:killing harmful _ as well as _u harming peoples health:These chemicals may make people _and ev

2、en _u Crops grow too fast to be _.bacteria and insectsthe helpful onesillrich in nutritioncause cancerfight crop diseaseincrease productionRead for informationOrganic farming is simply farming without using any chemicals.Organic farmers focus on keeping their soil rich and free of disease through na

3、tural means.Read for informationto make the soil richer in mineralsto put important minerals back into the ground to keep the soil richThe goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.Read for information A.Organic

4、 farming cost us a lot of money.B.Organic farming can meet peoples need.C.Chemical farming brought us huge profit.D.Chemical farming helps serve the need for food.Read for informationSome people would prefer to stop the use of man-made chemicals in agriculture entirely.What keeps them from doing so

5、is the fact that chemical farming serves the high demand 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

6、as possible.P5Farming Benefit Problem Solution Chemical farming Organic farmingfight crop disease;increase productionharm the land and the environment;harm peoples healthcrops are less in nutritionswitch to organic farmingmake the soil rich;keep the air,soil,water and crops free of chemicalscannot m

7、eet the high demand for food;more efforts and higher coststill a long way to find a suitable solutionRead for summaryRead for transitional words&phrasesPara1:howeverPara2:for example,in addition,in turn,in fact,as for,but,and,as wellPara3:as an alternative,for example,alsoPara4:also,for instance,for

8、 example,butPara5:thereforeargumentative writingTransition wordsFunction For example,Illustrating/support your ideas,but alsoAdding more information and emphasisingIn addition,Adding more informationIn turn,SequencingIn fact,Illustrating/EmphasizingAs forIntroducing a new topic/thing,butContrasting,

9、and as wellAdding more informationRead for transitional words&phrasesCHEMICAL VERSUS ORGANIC FARMINGchemical pesticidesartificial fertilisersin widespread use in farmingSince 1950smany farmers welcomed fight crop diseaseincrease productionlong-term use harm both the land and peoples health.Some scie

10、ntists have foundNOWP1RETELLINGP2spraying pesticides on cropsstay in the soil and underground water sources for a long timeaffectsthe cropsthe animals and humans bacteria&insectsharmful helpfulDAMAGETHE LANDDAMAGEOUR HEALTHmake illcause cancerRETELLINGP2Crops grown with them usually grow too fast to

11、 be rich in nutrition.They may look beautiful on the outside,but inside there is usually more water than essential minerals,and they often have less flavour as well.artificial/man-madefertilisers RETELLINGP3organic farmingswitch toorganic foodturn towithout using any chemicalskeeping their soil rich

12、 and free of disease through natural meansAdvantages/Positive Outcomessoil richer in mineralsthe air,soil,water and crops free of chemicalsnatural wastenatural means=RETELLINGSome people would prefer to stop the use of man-made chemicals in agriculture entirely.What keeps them from doing so is the f

13、act that chemical farming serves the high demand 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 possi

14、ble.P4Organic farmers also use many other methods to produce rich soil.They often change the kind of crop grown in each field every year.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 mineral

15、s back into the ground,making it ready again for the next batch of crops.Organic farmers also plant diverse crops that use different depths of soil 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 f

16、arming methods is to grow good food while avoiding damage to the environment or to peoples health.P5RETELLING1.When they were first introduced,many farmers _a great way _crop disease and increase production.当它们第一次被引进时,很多农民喜欢把它们作为防治农作物病虫害和提高产量的重要手段。2.Over time,however,_ some scientists have found is

17、_their long-term use can sometimes harm both the land and peoples health.然而,随着时间的推移,一些科学家发现它们的长期使用会造成土地受损,对人们的健康造成危害。welcomed them asto fightwhatthatKEY SENTENCES4._chemical fertilisers,crops grown with them usually grow _ _.至于化肥,施过化肥的农作物通常生长得过快而营养不足。5.Organic farming _meet that need.有机耕作完全不能满足那样的需求。6._keeps them from doing so is the fact _chemical farming serves the high demand for food around the world.3.This affects the crops _(生长在土地上的)and,_(转而),the animals and humans who digest them.grown on the landin turnKEY SENTENCESAs fortoo fast to berich in nutritionis nowhere near able toWhatthat