人教版高中英语配套ppt课件选修9 unit 4 period .ppt

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1、Unit4ExploringplantsTHEDESTRUCTIONOFTROPICALRAINFORESTSEdWalker(E)isinterviewingDrAnneButler(A)aboutthedestructionoftropicalrainforests.E：Anne，wehearalotthesedaysabouthowquicklytropicalrainforestsaredisappearing.A：Yes，that'sright.Rainforestsnowcoveronly6%oftheearth'slandsurface.Theyusedtoc

2、overabout14%，somorethanhalfoftheworld'stropicalrainforestshavebeendestroyed，andthat'sinlessthan50years.Over150acresofrainforestislosteveryminuteinAsia，Africa，CentralandSouthAmerica.E：That'sunbelievable.A：Yes，it'sfrightening.Thelastremainingrainforestscouldbegoneinlessthan40years.E：Butwhyis

3、thishappening?A：Well，thereareanumberofreasons.Aspopulationsincrease，peopleneedmorelandtoliveon.Forestsarecutdowntoplantcropsortostartfarms.Thewoodissoldforfirewoodorbuildingmaterials，furnitureandpaper，forexample.Andtherearealsominingcompanieswhichdestroytheforestsintheirsearchforminerals.E

4、：Isupposepeoplehavetomakealiving.A：Yes，butyouknow，peoplecanmakemoremoneybyharvestingthingslikefruits，nutsandoils，aswellasplantsthatcanbeusedinmedicinethanbycuttingdowntheforests.E：Ohreally？Ididn'tknowthat.Now，couldyououtlinesomeofthereasonswhyit'snotagoodideatodestroyrainforests?A：Sure.You

5、musthaveheardabouttherichanimalandplantlifeintropicalrainforests.Well，thereareabout10millionspeciesofplantsandanimalsintheworld.Morethanhalfoftheseliveinthetropicalrainforests.So，destroyingrainforestsmeansthatthousandsofthesespeciesaredyingoutbeforewe'veevenrealizedit.E：I'veheardtoothatthe

6、rainforestcouldprovideuswithcuresfordiseases.A：Yes，therearecertainlymanynewdrugswaitingtobediscovered.Anotherproblemisthatthedestructionofforestscontributestoglobalwarming.Also，rainforestsabsorbalotofrainsothatthere'saconstantsupplyofcleanwaterrunningintoriversandlakes.Ifthetreesarecutdown

7、，therainisn'tabsorbedandthereisflooding.E：So，whatcanindividualsdotohelpslowdownthedestruction?A：That'sagoodquestion...(fadeout)阅读短文，判断正(T)误(F)1．Rainforestscover14%oftheearth'slandsurface.()2．Morethanhalfoftherainforestshavedisappeared.()3．150acresofrainforesta