2013专升本英语模拟试题四.doc

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1、专升本英语模拟试题（四）模拟试题（四）PartIReadingComprehension(40%35minutes)Directions:Inthisparttherearefourpassages.Eachpassageisfollowedbyanumberofcomprehensionquestions.Readthepassageandchoosethebestanswertoeachquestion.Then,markyouranswerbyblackeningthecorrespondingletterontheAnswerSheet.Quest

2、ions1to5arebasedonthefollowingpassage:Agreenhouseisabuildingmadeofglasswhichisusedforkeepingplantswarmwhentheoutsidetemperatureislow.Inasimilarwaythereareseveralgasesintheatmosphere,whichtraptheheatproducedbythesunandpreventitfromescaping.Thesegasesareknownas“greenhousegases”,andt

3、hewayinwhichtheytrapheatintheatmosphereiscalledthe“greenhouseeffect”.Thisisnotsimplyairpollution.Mostofthemaingreenhousegasesexistnaturallyinsmallamountsinouratmosphere,andwithoutthemearthwouldbe30degreescolderandhumanlifewouldnotexist.Inotherwords,thegreenhouseeffectisanaturalcou

4、rsewhichistosomedegreehelpfultous.Theproblemisthatinthelastcenturyandahalf,wehavebeenputtingtoomanyofthesegasesintotheearth'satmospherebyburninglargequantitiesofcoalandoilandbycuttingdownforests.Therapidincreaseingreenhousegasesismakingtheworldwarmer.Theworld’stemperaturehasalread

5、ygoneupbyhalfadegreethiscentury,andthesealevelhasrisenby10centimeters.Iftheamountofcarbondioxideintheatmospheredoublestherewillprobablybeariseintheearth’stemperatureofbetween1and4.Thismayseemasmallincrease,butitwouldbeenoughtocausemajorchangesingeographyandagriculture.Largeareasof

6、theworldwouldbeflooded,andsomeareaswouldbecomedryandunabletoproducecrops.Itisimportant,too,toconsiderthattheremaybeadelayofabout30yearsinthegreenhouseeffect.Thismeansthatweareprobablyexperiencingonlynowtheeffectofthegasesputintotheatmospherebeforethe1960s.Sincethen,ouruseofthesega

7、seshasgreatlyincreased.1.“Greenhouseeffect”means_________.A.thewayinwhichgasesareusedforkeepingplantswarmB.anaturalcoursewhichistosomedegreehelpfultousC.theway"greenhousegases"trapheatontheearthD.thewholecourseinwhichgreenhousegasespreventheat2.Iftherewerenogreenhouseeffect,______

8、_____.A.noplantswouldgrowonourpla