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1、ThetwographsshowthemainsourcesofenergyintheUSAinthe1980sandthe1990s.Writeareportforauniversitylecturerdescribingthechangeswhichoccurred.modelanswer:ThetwographsshowthatoilwasthemajorenergysourceintheUSAinboth1980and1990andthatcoal,naturalgasandhydroelectricpowerremainedinmu
2、chthesameproportions.Ontheotherhand,therewasadramaticriseinnuclearpower,whichdoubleditspercentageoverthetenyears.Oilsuppliedthelargestpercentageofenergy,althoughthepercentagedecreasedfrom42%in1980to33%in1990.Coalin1990wasthesecondlargestsourceofenergy,increasingitsproportio
3、nto27%from22%inthepreviousdecade.Naturalgas,thesecondlargestsourcein1980at26%,decreaseditsshareveryslightlytoprovide25%ofAmerica’senergytenyearslater.Therewasnochangeinthepercentagesuppliedbyhydroelectricpowerwhichremainedat5%ofthetotalenergyused.Nuclearpowerthegreatestchange
4、:in1990itwas10%,twicethatofthe1980s.Thegraphbelowshowsthedifferencesinwheatexportsoverthreedifferentareas.Writeareportforauniversitylecturerdescribingtheinformationshownbelow.modelanswer:Thethreegraphsofwheatexportseachshowaquitedifferentpatternbetween1985and1990.Exportsfro
5、mAustraliadeclinedoverthefive-yearperiod,whiletheCanadianmarketfluctuatedconsiderably,andtheEuropeanCommunityshowedanincrease.In1985,Australiaexportedabout15millionsoftonnesofwheatandthefollowingyearthenumberincreasedbyonemilliontonnesto16million.Afterthat,however,therewasa
6、gradualdeclineuntil1989and1990whenitstabilisedatabout11milliontonnes.Overthesameperiod,theamountofCanadianexportsvariedgreatly.Itstartedat19milliontonnesin1985,reachedapeakin1988of24million,droppeddramaticallyin1989to14milliontonnesandthenclimbedbackto19millionin1990.Seventee
7、nmilliontonneswereexportedfromtheEuropeanCommunityin1985,butthisdecreasedto14milliontonnesin1986andthenroseto15millionin1987and1988beforeincreasingoncemoreto20millionin1990.Theflowchartillustratestheproductionofcolouredplasticpaperclipsinasmallfactory.Writeareportforaunivers
8、itytutordescribingtheproductionprocess.Therearefourmainstagesinthepr