话题七：生态环保类(一)Theneedtofeedagrowingpopulationisputtingmuchpressureontheworld'ssupplyofwater.With97%oftheworld'swatertoosaltytobedrunkorusedinagriculture,theworldwidesupplyofwaterneedscarefulmanagement,especiallyinagriculture.Althoughtheideaofawatershortage(短缺)seemsstrangetosomeonefortunateenoughtoliveinahighrainfallcountry,manyoftheworld'sagriculturalindustriesexperienceconstantwatershortages.Althoughdamscanbebuilttostorewaterforagriculturaluseindryareasanddryseasons,thecostsofwaterredistribution(重新分配)areveryhigh.Notonlyistherethecostoftheengineeringitself,butthereisalsoanenvironmentalcosttobeconsidered.Wherevalleys(山谷)arefloodedtocreatedams,housesarelostandwildlifehomesdestroyed.Besides,watermayfloweasilythroughpipestofields,butitcannotbetransportedfromonesideoftheworldtotheother.Eachcountrymustthereforerelyonthemanagementofitsownwatertosupplyitsfarmingrequirements.Thisisparticularlytroublingforcountrieswithagriculturalindustriesinareasdependentonirrigation(灌溉).InTexas,farmers'overuseofirrigationwaterhasresultedina25%reductionofthewaterstores.IntheCentralValleyareaofsouthwesternUSA,ahugewaterengineeringprojectprovidedwaterforfarmingindryvalleys,butmuchofthewaterusehasbeenpoorlymanaged.SaudiArabia'sattemptstogrowwheatindesertareashaveseenthepumpingofhugequantitiesofirrigationwaterfromundergroundreserves.Becausethereisnorainfallintheseareas,suchreservescanonlydecrease,anditisbelievedthatfiftyyearsofpumpingwillseethemrundry.1.Fromthefirsttwoparagraphswelearnthat________.A.muchoftheworld'swaterisavailableforuseB.peopleinhighrainfallcountriesfeelluckyC.thecostsofwaterredistributionshouldbeconsideredD.watercanbeeasilycarriedthroughpipesacrosstheworld2.WhichofthefollowingisTRUE?A.ThewaterstoresinTexashavebeenreducedby75%.B.Mostindustriesintheworldsufferfromwatershortages.C.TheundergroundwaterinSaudiArabiamightrunoutin50years.D.GoodmanagementofwateruseresultedfromtheprojectintheCentralValley.3.Whatismostlikelytobediscussedintheparagraphthatfollows?A.Stepstoimprovingwaterusemanagement.B.Waystoreducethecostsofbuildingdams.C.Measurestodealwithworldwidewatershortages.D.Approachestohandlingthepressureonwatersupply.4.Thetextismainlyabout________.A.watersupplyandincreasingpopulationB.waterusemanagementandagricultureC.waterredistributionandwildlifeprotectionD.watershortagesandenvironmentalprotection答案与解析世界的可用淡水资源有限，但农业在利用水资源过程中存在不尽如人意之处本文指出了其中的一些问题。1．C细节理解题，由文中第一段第二句“With97%oftheworld'swatertoosaltytobedrunkorusedinagriculture...”可知A选项错误；由第一段第三句第1页共6页“...strangetosomeonefortunateenoughtoliveinahighrainfallcountry...”可知B选项不合文意；第二段前两句指出水资源的重新分配的费用极高，一方面是水利过程本身的造价，另一方面也会对生态造成极大的破坏，所以选项C正确，根据第二段第四句“...itcannotbetransportedfromonesideoftheworldtotheother.”可知D项不正确。2．C细节理解题。根据文章第三段第二句“...hasresultedina25%reductionofthewaterstores.”可判断A选项不正确；由第一段最后一句可判断B选项错误；由文章最后一句“...fiftyyearsofpumpingwillseethemrundry.”可知C项正确。根据文章第三段最后一句可知D项不正确。3．A判断推理题。文章前面一部分主要是讲述农业在利用水资源过程中存在的问题，接下来应该是介绍加强水资源管理的方法和措施，所以A选项正确。4．B主旨大意题。由第一段第二句可知。(二)ItwasavillageinIndia.Thepe...
