大学英语四级考试模拟试题5Word格式文档下载.docx

大学英语四级考试模拟试题5Word格式文档下载.docx

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PartⅠWriting（30minutes）

Directions:

Forthispart,youareallowedthirtyminutestowriteacompositiononthetopic:

AidEducationinChina.Youshouldwriteatleast120wordsfollowingtheoutlinegiveninChinesebelow:

1.每年，高校许多大学生受到鼓舞去贫困地区支教。

2.支教活动的意义。

3.我的看法。

PartⅡReadingComprehension（SkimmingandScanning）（15minutes）

Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,mark

Y（forYES）ifthestatementagreeswiththeinformationgiveninthepassage;

N（forNO）ifthestatementcontradictstheinformationgiveninthepassage;

NG（forNOTGIVEN）iftheinformationisnotgiveninthepassage.

Forquestions8-10,completethesentenceswithinformationgiveninthepassage.

WillWeRunOutofWater?

Picturea“ghostship”sinkingintothesand,lefttorotondrylandbyarecedingsea.Thenimagineduststormssweepinguptoxicpesticidesandchemicalfertilizersfromthedryseabedandspewingthemacrosstownsandvillages.

Seemlikeascenefromamovieabouttheendoftheworld?

ForpeoplelivingneartheAralsea（咸海）inCentralAsia,it’salltooreal.Thirtyyearsago,governmentplannersdivertedtheriversthatflowintotheseainordertoirrigate（providewaterfor）farmland.Asaresult,theseahasshrunktohalfitsoriginalsize,stranding（使搁浅）shipsondryland.Theseawaterhastripledinsaltcontentandbecomepolluted,killingall24nativespeciesoffish.

Similarlarge--scaleeffortstoredirectwaterinotherpartsoftheworldhavealsoendedinecologicalcrisis,accordingtonumerousenvironmentalgroups.Butmanycountriescontinuetobuildmassivedamsandirrigationsystems,eventhoughsuchprojectscancreatemoreproblemsthantheyfix.Why?

Peopleinmanypartsoftheworldaredesperateforwater,andmorepeoplewillneedmorewaterinthenextcentury.

“Growingpopulationswillworsenproblemswithwater,”saysPeterH.Gleick,anenvironmentalscientistatthePacificInstituteforstudiesinDevelopment,Environment,andSecurity,aresearchorganizationinCalifornia.Hefearsthatbytheyear2025,asmanyasone--thirdoftheworld’sprojected（预测的）8.3billionpeoplewillsufferfromwatershortages.

WHEREWATERGOES

Only2.5percentofallwateronEarthisfreshwater,watersuitablefordrinkingandgrowingfood,saysSandraPostel,directoroftheGlobalWaterPolicyProjectinAmherst,Mass.Two--thirdsofthisfreshwaterislockedinglaciers（冰山）andicecaps（冰盖）.Infact,onlyatinypercentageoffreshwaterispartofthewatercycle,inwhichwaterevaporatesandrisesintotheatmosphere,thencondensesandfallsbacktoEarthasprecipitation（rainorsnow）.

Someprecipitationrunsofflandtolakesandoceans,andsomebecomesgroundwater,waterthatseepsintotheearth.MuchofthisrenewablefreshwaterendsupinremoteplacesliketheAmazonriverbasininBrazil,wherefewpeoplelive.Infact,theworld’spopulationhasaccesstoonly12,500cubickilometersoffreshwater—abouttheamountofwaterinLakeSuperior（苏必利尔湖）.Andpeopleusehalfofthisamountalready.“Ifwaterdemandcontinuestoclimbrapidly,”saysPostel,“therewillbesevereshortagesanddamagetotheaquatic（水的）environment.”

CLOSETOHOME

Waterwoes（灾难）mayseemremotetopeoplelivinginrichcountriesliketheUnitedStates.ButAmericanscouldfaceseriouswatershortages,tooespeciallyinareasthatrelyongroundwater.Groundwateraccumulatesinaquifers（地下蓄水层），layersofsandandgravelthatliebetweensoilandbedrock.（Foreveryliterofsurfacewater,morethan90litersarehiddenunderground.）AlthoughtheUnitedStateshaslargeaquifers,farmers,ranchers,andcitiesaretappingmanyofthemforwaterfasterthannaturecanreplenish（补充）it.InnorthwestTexas,forexample,overpumpinghasshrunkgroundwatersuppliesby25percent,accordingtoPostel.

Americansmayfaceevenmoreurgentproblemsfrompollution.DrinkingwaterintheUnitedStatesisgenerallysafeandmeetshighstandards.Nevertheless,oneinfiveAmericanseverydayunknowinglydrinkstapwatercontaminatedwithbacteriaandchemicalwastes,accordingtotheEnvironmentalProtectionAgency.InMilwaukee,400,000peoplefellillin1993afterdrinkingtapwatertaintedwithcryptosporidium（隐孢子虫），amicrobe（微生物）thatcausesfever,diarrhea（腹泻）andvomiting.

THESOURCE

Wheresocontaminantscomefrom?

Indevelopingcountries,peopledumpraw（未经处理的）sewage（污水）intothesamestreamsandriversfromwhichtheydrawwaterfordrinkingandcooking;

about250millionpeopleayeargetsickfromwaterborne（饮水传染的）diseases.

Indevelopedcountries,manufacturersuse100,000chemicalcompoundstomakeawiderangeofproducts.Toxicchemicalspollutewaterwhenreleaseduntreatedinto