大学英语考试复习资料大学四级模拟1071.docx

大学英语考试复习资料大学四级模拟1071.docx

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大学英语考试复习资料大学四级模拟1071

[大学英语考试复习资料]大学四级模拟107

大学四级模拟107

PartⅠWriting

Directions:

Forthispart,youareallowed30minutestowritealetterofadvicetoyourcousinabouthowtospendthefirstwinterholidayincollege.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelow.

问题:

1.机动车被看作是空气污染的首要原因

2.提出解决这一问题的方法

3.并说明原因

OneWaytoSolvetheProblem

答案:

OneWaytoSolvetheProblem

TodealwiththeairpollutioncausedbyVehiclesincitiesisachallengingjob.Mysuggestionistoproducevehiclespoweredbysolarenergy.

Comparedwithmineralfuelssuchasgasoline,solarenergyisinexhaustibleinsupply.Thegrowthofcitiesandincreaseofvehiclescallformoresupplyofenergy,butthereisalimittothereserveofoff.Sosolarenergywithitsendlesssupplyisoneofoursolutionstoenergycrisis.Thesecondadvantageofsolarenergyisitscleanliness.Traditionalvehiclesoperatingongasolinegiveoffexhaust,causingdamagetohumanhealthandpollutingtheair.Fromtheperspectiveofenvironmentalprotectionsolarenergyisamuchbetterchoice.Afterthenewtechnologybecomeseconomicallyfeasible,theskyovercitieswillbebrighter,andtheairwillnolongerbeathreattoourhealth.

Becauseofthetwobenefitsofusingsolarenergyasanewfuel,weshouldspendmoremoneyontheresearchwhichcanmakeourdreamcometrue.

PartⅡReadingComprehension（SkimmingandScanning）

ADelicateBalance

In1965theAmericanstatesmanAdlaiEStevensonsaid,"Wealltraveltogether,passengersonalittlespaceship,dependentonitsvulnerablesuppliesofairandsoil.Wemanagetosurvivebythecare,work,andlovewegiveourfragilecraft."Ourplanetisindeedfragile.Everylivingthingonthisplanetispartofacomplicatedweboflife,fornoorganismlivesentirelyonitsown.Everyorganismisaffectedbyallthatsurroundsitwhetherlivingornonliving.Andinturneachorganismhassomeeffectonitssurroundings.

Eventhemostelementaryunderstandingofecologyrequiresknowledgeofthiscause/effectrelationshipallorganismshaveoneachother.Everythingwedotoourenvironmentwillinonewayoranotheraffectthequalityoflifeweexperienceonthistinyspaceship.Ifwewantthequalityoflifetobehigh,wemustbemoreawarethatnatureisafinelybalancedmechanismandthatitwillnottoleratetheabusewehavebeengivingit.Considerthefollowingexamplesofhumanignoranceconcerningthedelicatebalanceofnature.

AswanandOtherFables

"Oncetherewasacountrythatdesperatelyneededfoodandenergyforitsgrowingpopulation.Ithappenedthatoneofthemostmagnificentriversintheworldflowedthroughthiscountry.Eachyeartheriverdepositedtonsofmineral-richsiltonitsfertilefloodplainbeforeitreachedthesea."Whynotdamtheriver,"saidthecountry'sleaders,"andusethewatertoirrigatemoreland,controltheannualspringfloodingoftheriver,andprovidehydroelectricpowerallatthesametime?

"Theresultofthismodern-dayfairytaleisknownasthebillion-dollarAswanHighDamofEgypt,andnotallEgyptiansarelivinghappilyeverafter.

"Foronething,aswaterbackedupbehindthedam,almost100,000EgyptianshadtochoosebetweengivinguptheirfamilyhomesandbeingsubmergedalongwithancientandpricelesstemplesthatwerepartofEgypt'sculturalheritage.Buttherehavebeenfarmoredevastatingresults.NowthattheNileRiverfloodplainisdeprivedofitsannualenrichmentwithsilt,artificialfertilizerhastobetruckedinatacostof100milliondollarsayear—acostcarriedbythesubsistencefarmerswhomake,ontheaverage,lessthanahundreddollarsayeareach.Furthermore,nowthereisnothingtowashawaythepreviousyear'ssiltbuildupinthesoil.Andwithsiltdepositsnolongercompensatingforerosion,thefertileriverdeltaisshrinking—andanalarmingpartofwhatremainshascompletelydriedup.Restoringthedeltawithpumps,drains,andwellsmaycostmorethanthedamitself."

"Ironically,evaporationaswellasbottomseepagefromthenewlakefillinginbehindthedamissogreatthatthelakebasinmayneverfilluptopredictedlevels.Sonobodycanlivearoundthelakebecausenobodyknowsforsurewheretheshorelinewillbe.Moreseriously,thereislesswatertogoaroundthantherewasbefore.Andeventhoughsome700,000newacres（about1.6millionhectares）havebeenopenedupforagriculture,thepopulationoutgrewthepotentialfoodincreaseevenbeforethedamwasfinished.Atthesametime,withthenutrient-richflowoftheNileturnedoff,anothermajorfoodsource-thesardines,shrimp,andmackerelthatflourishedintheenrichedwatersoffthedelta—hasdeclinedcatastrophically.Worseyet,thelakeandtheirrigationnetworkshavesoacceleratedthespreadofbloodflukest