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时间:2020-01-24
《Unit 4 Exploring plants Period 1 Warming Up,Prereading & Reading 课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Unit4ExploringplantsPeriod1WarmingUp,Prereading&Reading课件THEDESTRUCTIONOFTROPICALRAINFORESTSEdWalker(E)isinterviewingDrAnneButler(A)aboutthedestructionoftropicalrainforests.E:Anne,wehearalotthesedaysabouthowquicklytropicalrainforestsaredisappearing.A:Yes,that'srig
2、ht.Rainforestsnowcoveronly6%oftheearth'slandsurface.Theyusedtocoverabout14%,somorethanhalfoftheworld'stropicalrainforestshavebeendestroyed,andthat'sinlessthan50years.Over150acresofrainforestislosteveryminuteinAsia,Africa,CentralandSouthAmerica.E:That'sunbelievable
3、.A:Yes,it'sfrightening.Thelastremainingrainforestscouldbegoneinlessthan40years.E:Butwhyisthishappening?A:Well,thereareanumberofreasons.Aspopulationsincrease,peopleneedmorelandtoliveon.Forestsarecutdowntoplantcropsortostartfarms.Thewoodissoldforfirewoodorbuildingma
4、terials,furnitureandpaper,forexample.Andtherearealsominingcompanieswhichdestroytheforestsintheirsearchforminerals.E:Isupposepeoplehavetomakealiving.A:Yes,butyouknow,peoplecanmakemoremoneybyharvestingthingslikefruits,nutsandoils,aswellasplantsthatcanbeusedinmedicin
5、ethanbycuttingdowntheforests.E:Ohreally?Ididn'tknowthat.Now,couldyououtlinesomeofthereasonswhyit'snotagoodideatodestroyrainforests?A:Sure.Youmusthaveheardabouttherichanimalandplantlifeintropicalrainforests.Well,thereareabout10millionspeciesofplantsandanimalsinthew
6、orld.Morethanhalfoftheseliveinthetropicalrainforests.So,destroyingrainforestsmeansthatthousandsofthesespeciesaredyingoutbeforewe'veevenrealizedit.E:I'veheardtoothattherainforestcouldprovideuswithcuresfordiseases.A:Yes,therearecertainlymanynewdrugswaitingtobediscov
7、ered.Anotherproblemisthatthedestructionofforestscontributestoglobalwarming.Also,rainforestsabsorbalotofrainsothatthere'saconstantsupplyofcleanwaterrunningintoriversandlakes.Ifthetreesarecutdown,therainisn'tabsorbedandthereisflooding.E:So,whatcanindividualsdotohelp
8、slowdownthedestruction?A:That'sagoodquestion...(fadeout)阅读短文,判断正(T)误(F)1.Rainforestscover14%oftheearth'slandsurface.()2.Morethanhalfoftherainforestshave
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