高中英语Unit 2 Working the land 课件 4

Unit2WorkingthelandTask1:BrainstormingWhatwillyouthinkofwhenyouseetheword“agriculture”?agriculturefarmirrigationfoodcropfieldplantsplainGMFgrainfarmerfertilizerseedprairiecountrysidelandarablelandagriculturewheatcornricesoybeancottonbroomcorn

peanutTerraceDroughtIrrigatedlandGreenhouseInthefirstpicture:

*Terracedfields.Inthesecondpicture:

*Drybarrenfarmland.Inthethirdpicture:

*Irrigatedfarmland.Inthefourthpicture:

*Greenhouses.

Whatarethedifferences?Comparetheoldandthemodernwaysofirrigation.NaturalClimateControlledClimateinbadweather,cropslostclimatecontrolled,lessdamageThelandscapelosesitsnaturalbeauty.Onlyarablelandcangrowcrops.Greenhousescanbebuiltalmosteverywhere.Thelandscapeismorebeautiful.Ifthereisapowerfailure,youmaylosecrops.Whataregenetically-modifiedfoods?

ThetermGMfoodsorGMOs(genetically-modifiedorganisms)ismostcommonlyusedtorefertocropplantscreatedforhumanoranimalconsumptionusingthelatestmolecularbiologytechniques.Theseplantshavebeenmodifiedinthelaboratorytoenhancedesiredtraitssuchasincreasedresistancetoherbicidesorimprovednutritionalcontentveryrapidlyandwithgreataccuracy.Forexample,plantgeneticistscanisolateageneresponsiblefordroughttoleranceandinsertthatgeneintoadifferentplant.Thenewgenetically-modifiedplantwillgaindroughttoleranceaswell.

WhataresomeoftheadvantagesofGMfoods?

Theworldpopulationhastopped6billionpeopleandispredictedtodoubleinthenext50years.Ensuringanadequatefoodsupplyforthisboomingpopulationisgoingtobeamajorchallengeintheyearstocome.GMfoodspromisetomeetthisneedinanumberofways:（1）Pestresistance（2）Diseaseresistance（3）Coldtolerance

（4）Droughttolerance/salinitytolerance5).NutritionThirteencountriesgrewgenetically-engineeredcropscommerciallyin2000,andofthese,theU.S.producedthemajority.In2000,68%ofallGMcropsweregrownbyU.S.farmers.Incomparison,Argentina,CanadaandChinaproducedonly23%,7%and1%,respectively.Soybeansandcornarethetoptwomostwidelygrowncrops(82%ofallGMcropsharvestedin2000)WhataresomeofthecriticismsagainstGMfoods?

MostconcernsaboutGMfoodsfallintothreecategories:environmentalhazards,humanhealthrisks,andeconomicconcerns.Everyeightseconds,achildsomewhereintheworlddiesfromstarvation.Morethan6millionchildrenundertheageof5diefromstarvationeveryyear.Morethan800millionpeopleintheworldsufferfromchronicmalnutrition—799millionofthemarefromthedevelopingworld.Morethen153ofthemareundertheageof5.Some700,000CentralAmericansaresufferingfromhungertoday,including6,000childrenatriskofstaringtodeath.Discussion:Whatwillyouthinkafterreadingthefollowingfacts?Reading:IsYuanLongpingmoreofascientistthanafarmer?WhatareYuanLongping’sachievements?Whatwerehisdreamsandhowfardidheachievethem?Gerund动名词1.Usagea.Climbingmountainsishardwork.(It’shardworkclimbingmountains.)主语Sheenjoysacting.b.Thankyoufortellingmethetruth.宾语c.Myjobisteaching.表语d.Therearealotofbooksinthereadingroom.定语e.Icaughtthethiefstealing.宾语补足语2.Verb.习惯上只接动名词的动词admit,advise,allowappreciate,avoid,consider,delay,deny,risk,practise,finish,forbid,giveup,forgive,enjoy,escape,imagine,mind,mention,suggest,putoff,permit,prohibit,report可接不定式和动名词且含义相同的动词Like,love,hate,prefer,begin,start,continue,intend,attempt,bother可接不定式和动名词且含义不同的动词Remember,forget,regret,try,mean,stop,goon3.Tense现在Ilikecollectingstamps.Wouldyoumindclosingthedoor?Irememberbringingthebookwithme.b.完成HeforgothavingpromisedmetobuymeaCD.Thankyouforhavingtoldmethenews.4.VoiceHedidn’tmindbeingcalled“potato”.Hedidn’tmindcaringforthebaby.Notice:“need”,“want”,“require”,“beworth”主动表被动Thiscoatwantswashing.Thetaskisworthdoing.Thebikerequires/needsmending.Words&Expressions1.Dr.Yuansearchedforawaytoincreasericeharvestswithoutexpandingtheareaoffields.Thepolicearesearchingforthemurderer.Thepoliceare

.inofsearchexpand:

tobecomelargerinsize增大ThepopulationofChinaexpandedquicklyinthe1960s.Youcanexpandyourknowledgebyreadingmorebooks.expansionn.expandableadj.2.Dr.YuanisnowcirculatinghisknowledgeinIndia,...circulate:tomovearoundwithinasystem循环becameknownbyothers交流Rumorscirculatedquickly.Thebloodcirculatesaroundthebody.circulationn.3.Thankstohisresearch,theUNistryingtoridtheworldofhunger.thanksto:duetobecauseofThankstoyourhelp,Ipassedtheexam.Thankstohishelp,Janewillbebacksoon.ridsb./sth.ofsth.Thevaccinationprogramwillridtheworldofsmallpox.Sheistryingtoridherselfofadependenceondrugs.Youshouldridyourselfofthebadhabits.=Youshouldgetridofthebadhabits4.Sohegivesmillionsofyuantoequipothersfortheirresearchinagriculture.equip:toprovidewiththingsTheboysequippedthemselveswithtorchesandrope,andsetoff.Theemergencyservicesareequippedtodealwithdi