大学英语四级模拟题五及答案

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PartIWriting（30minutes）
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopicChoosinganOccupation.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelowinChinese:
1.选择职业是一个人要面对的众多难题之一。
2.需要花时间去选择职业。
3.选择职业时可以向多人寻求建议和帮助。
ChoosinganOccupation
PartIIReadingComprehension(SkimmingandScanning)(15minutes)
Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestiononAnswerSheet1.
Forquestions1-7,mark
Y(forYES)ifthestatementagreeswiththeinformationgiveninthepassage;
N(forNO)ifthestatementcontradictstheinformationgiveninthepassage;
NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.
Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.
WillWeRunOutofWater?
Picturea"ghostship"sinkingintothesand,lefttorotondrylandbyarecedingsea.Thenimagineduststormssweepinguptoxicpesticidesandchemicalfertilizersfromthedryseabedandspewingthemacrosstownsandvillages.
Seemlikeascenefromamovieabouttheendoftheworld?ForpeoplelivingneartheAralSeainCentralAsia,it'salltooreal.Thirtyyearsago,governmentplannersdivertedtheriversthatflowintotheseainordertoirrigate（providewaterfor）farmland.Asaresult,theseahasshrunktohalfitsoriginalsize,strandingshipsondryland.Theseawaterhastripledinsaltcontentandbecomepolluted,killingall24nativespeciesoffish.
Similarlargescaleeffortstoredirectwaterinotherpartsoftheworldhavealsoendedinecologicalcrisis,accordingtonumerousenvironmentalgroups.Butmanycountriescontinuetobuildmassivedamsandirrigationsystems,eventhoughsuchprojectscancreatemoreproblemsthantheyfix.Why?Peopleinmanypartsoftheworldaredesperateforwater,andmorepeoplewillneedmorewaterinthenextcentury.
"Growingpopulationswillworsenproblemswithwater,"saysPeterH.Gleick,anenvironmentalscientistatthePacificInstituteforstudiesinDevelopment,Environment,andSecurity,aresearchorganizationinCalifornia.Hefearsthatbytheyear2025,asmanyasonethirdoftheworld'sprojected8.3billionpeoplewillsufferfromwatershortages.
WhereWaterGoes
Only2.5percentofallwateronEarthisfreshwater,watersuitablefordrinkingandgrowingfood,saysSandraPostel,directoroftheGlobalWaterPolicyProjectinAmherst,Mass.Twothirdsofthisfreshwaterislockedinglaciersandicecaps.Infact,onlyatinypercentageoffreshwaterispartofthewatercycle,inwhichwaterevaporatesandrisesintotheatmosphere,thencondensesandfallsbacktoEarthasprecipitation（rainorsnow）.
Someprecipitationrunsofflandtolakesandoceans,andsomebecomesgroundwater,watertha