2008年11月学位英语（完形填空） - 详解版（20题）

本资料由小桨备考整理，仅供学习参考，非官方发布2008年11月学位英语（完形填空）单选题（共20题，共20分）1.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(56)A.warmerB.colderC.betterD.worse答案：D2.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(57)A.landB.agricultureC.climateD.weather答案：C3.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(58)A.lowerB.higherC.normalD.proper答案：B4.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(59)A.goodB.generalC.seriousD.useful答案：C5.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(60)A.gettingB.playingC.takingD.growing答案：D6.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(61)A.muchB.manyC.amountD.number答案：C7.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(62)A.fallB.decreaseC.refuseD.rise答案：B8.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(63)A.leadB.keepC.makeD.cause答案：D9.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(64)A.increaseB.dropC.liftD.realize答案：A10.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(65)A.waterB.rainC.stoneD.ice答案：D11.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(66)A.degreeB.levelC.coastD.area答案：B12.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(67)A.byB.toC.ofD.with答案：A13.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(68)A.aboveB.underC.belowD.over答案：B14.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(69)A.littleB.manyC.fewD.much答案：D15.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(70)A.IfB.BecauseC.WhenD.Why答案：C16.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesuncanpassthroughtheblankettowarmtheearth.Theheat__75__thereandcan’tescapethroughtheblanketagain.Scientistscallthisthegreen-houseeffect.(71)A.sunlightB.airC.rainD.gas答案：A17.PartIVCloze(10%)Directions:Thereare20blanksinthefollowingpassage,andforeachblankthereare4choicesmarkedA,B,CandDattheendofthepassage.ThenblackenthecorrespondingletterontheAnswerSheet.Scientistssaythatsomethingveryseriousishappeningtotheearth.Itwillbegintoget__56__inthefollowingyears.Therewillbemajorchangesin___57__inthenewcentury.Coastalwaterswillhavea__58__temperature.Thiswillhavea__59__effectonagriculture.Innorthernareas,the__60__seasonwillbetendayslongerbytheyear2010.However,inwarmerareas,itwillbetoodry.The__61__ofwatercould__62__byeightypercent.Thiswould__63__alargedecreaseinagricultureproduction.Worldtemperaturecould__64__twodegreescentigradebytheyear2040.However,theincreasecouldbethreetimesasgreatintheArticandAntarcticarea.Thiscouldcausethe__65__sheetstomeltandraisethe__66__oftheoceans__67__onetotwometers.Manycoastalcitieswouldbe__68__water.Whyisthishappening?Thereistoo__69__carbondioxideintheair.__70__oil,gasandcoalburn,theycreatelargeamountsofcarbondioxide.Thiscarbondioxidelets__71__entertheearth’satmosphereand__72__theearth.However,itdoesn’tletasmuchheat__73__theatmosphereandenterspace.It’slikeablanket.Theheat__74__thesun