最新份英语四级全真模拟题文档格式.docx
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最新份英语四级全真模拟题文档格式.docx
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PartIWriting(30minutes)
Directions:
Forthispart,youareallowed30minutestowriteacompositiononetopic:
CityProblems.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelowinChinese:
1.越来越多的人涌入大城市,有些问题随之产生
2.比较明显的大问题有……
3.我对这种现象的想法
CityProblems
PartIIReadingComprehension(SkimmingandScanning)(15minutes)
Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,mark
Y(forYES)ifthestatementagreeswiththeinformationgiveninthepassage;
N(forNO)ifthestatementcontradictstheinformationgiveninthepassage;
NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.
Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.
ScientistsWeighOptionsforRebuildingNewOrleans
Asexpertsponderhowbesttorebuildthedevastated(毁坏)city,onequestioniswhethertowalloff—orworkwith—thewater.
EvenbeforethedeathtollfromHurricaneKatrinaistallied,scientistsarecautiouslybeginningtodiscussthefutureofNewOrleans.FewseemtodoubtthatthisvitalheartofU.S.commerceandculturewillberestored,butexactlyhowtorebuildthecityanditsdefensestoavoidarepeatcatastropheisanopenquestion.PlansforimprovingitsleveesandrestoringthebarrierofwetlandsaroundNewOrleanshavebeenonthetablesince1998,butfederaldollarsneededtoimplementthemneverarrived.Afterthetragedy,that‘sboundtochange,saysJohnDay,anecologistatLouisianaStateUniversity(LSU)inBatonRouge.Andifthereisanupsidetothedisaster,hesays,it’sthat‘nowwe’vegotacleanslatetostartfrom.“
ManyarelookingforguidancetotheNetherlands,acountrythat,justlikebowl-shapedNewOrleans,sitsmostlybelowsealevel,keepingthewateratbaywithaconstructionofamazingscaleandcomplexity.Others,pointingtoVenice‘slong-standingadaptations,sayit’sbesttoletwaterflowthroughthecity,depositingsedimenttooffsetgeologicsubsidence—amodelthatwouldrequirearadicalrethinkingofarchitecture.Anotherideaistoletnaturehelpbyrestoringthewetlandbuffersbetweenseaandcity.
Butbeforetheoptionscanbeweighed,severalunknownswillhavetobeaddressed.Oneispreciselyhowthecurrentdefensesfailed.Toanswerthat,LSUcoastalscientistsPaulKempandHassanMashriquiarepickingtheirwaythroughthedestroyedcityandsurroundingregion,reconstructingthesizeofwatersurgesbymeasuringtelltalemarksleftonthesidesofbuildingsandhighwaystructures.TheyarefeedingthesedataintoasimulationofthewindandwateraroundNewOrleansduringitsordeal.
”Wecan‘tsayforsureuntilthisjobisdone,“saysDay,”buttheemergingpictureisexactlywhatwe’vepredictedforyears.“Namely,severalcanals—includingtheMRGO,whichwasbuilttospeedshippinginthe1960s—havethecombinedeffectoffunnelingsurgesfromtheGulfofMexicorighttothecity‘seasternleveesandthelakesystemtothenorth.Thosesurgesaretoblamefortheflooding.”Oneofthefirstthingswe’llseedoneisthecompletebackfillingoftheMRGOcanal,“predictsDay,”whichcouldtakeacoupleofyears.“
Thelevees,whichhavebeenprovisionallyrepaired,willbeshoredupfurtherinthemonthstocome,althoughtheirlong-termfateisunclear.Betterleveeswouldprobablyhavepreventedmostofthefloodinginthecitycenter.Toprovidefurtherprotection,amobiledamsystem,muchlikeastormsurgebarrierintheNetherlands,couldbeusedtocloseoffthemouthofLakePontchartrain.Butmostexpertsagreethattheseareshort-termfixes.
ThebasicproblemforNewOrleansandtheLouisianacoastlineisthattheentireMississippiRiverdeltaissubsidinganderoding,plungingthecitydeeperbelowsealevelandremovingathickcushionofwetlandsthatoncebufferedthecoastlinefromwindandwaves.Partofthesubsidenceisgeologicandunavoidable,butthereststemsfromtheleveesthathavehemmedintheMississippiallthewaytoitsmouthfornearlyacenturytopreventfloodsandfacilitateshipping.Asaresult,riversedimentisnolongerspreadacrossthedeltabutdumpedintotheGulfofMexico.Withoutaconstantstreamoffreshsediment,thebarrierislandsandmarshesaredisappearingrapidly,withaquarter,roughlythesizeofRhodeIsland,alreadygone.
Afteryearsofpoliticalwrangling,abroadgrouppulledtogetherbytheLouisianagovernmentin1998proposedamassive$14billionplantosavetheLouisianacoasts,calledCoast2050(nowmodifiedintoaplancalledtheLouisianaCoastalAreaproject)。
Wetlandrestorationwasakeycomponent.”It‘soneofthebestandcheapesthurricanedefenses,“saysDay,whochaireditsscientificadvisorycommittee.
Althoug
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