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1、Youshouldspendabout20minutesonthistask.ThetwographsshowthemainsourcesofenergyintheUSAinthe1980sandthe1990s.Writeareportforauniversitylecturerdescribingthechangeswhichoccurred.Writeatleast150words.modelanswer:ThetwographsshowthatoilwasthemajorenergysourceintheUSAinboth1980and199
2、0andthatcoal,naturalgasandhydroelectricpowerremainedinmuchthesameproportions.Ontheotherhand,therewasadramaticriseinnuclearpower,whichdoubleditspercentageoverthetenyears.Oilsuppliedthelargestpercentageofenergy,althoughthepercentagedecreasedfrom42%in1980to33%in1990.Coalin1990wast
3、hesecondlargestsourceofenergy,increasingitsproportionto27%from22%inthepreviousdecade.Naturalgas,thesecondlargestsourcein1980at26%,decreaseditsshareveryslightlytoprovide25%ofAmerica’senergytenyearslater.Therewasnochangeinthepercentagesuppliedbyhydroelectricpowerwhichremainedat5%
4、ofthetotalenergyused.Nuclearpowerthegreatestchange:in1990itwas10%,twicethatofthe1980s.Youshouldspendabout20minutesonthistask.Thegraphbelowshowsthedifferencesinwheatexportsoverthreedifferentareas.Writeareportforauniversitylecturerdescribingtheinformationshownbelow.Writeatleast15
5、0words.modelanswer:Thethreegraphsofwheatexportseachshowaquitedifferentpatternbetween1985and1990.ExportsfromAustraliadeclinedoverthefive-yearperiod,whiletheCanadianmarketfluctuatedconsiderably,andtheEuropeanCommunityshowedanincrease.In1985,Australiaexportedabout15millionsoftonne
6、sofwheatandthefollowingyearthenumberincreasedbyonemilliontonnesto16million.Afterthat,however,therewasagradualdeclineuntil1989and1990whenitstabilisedatabout11milliontonnes.Overthesameperiod,theamountofCanadianexportsvariedgreatly.Itstartedat19milliontonnesin1985,reachedapeakin19
7、88of24million,droppeddramaticallyin1989to14milliontonnesandthenclimbedbackto19millionin1990.SeventeenmilliontonneswereexportedfromtheEuropeanCommunityin1985,butthisdecreasedto14milliontonnesin1986andthenroseto15millionin1987and1988beforeincreasingoncemoreto20millionin1990.Yoush
8、ouldspendabout20minutesonthistask.Theflowchartillustra
