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英语专四阅读理解练习题2017年英语专四阅读理解练习题时间给勤奋者以荣誉，给懒汉以耻辱。以下是小编为大家搜索整理的2017年英语专四阅读理解练习题，希望能给大家带来帮助，更多精彩内容请及时关注我们应届毕业生考试网!SECTIONBSKIMMINGANDSCANNING[5MIN.]Inthissectiontherearefivepassageswithatotaloftenmultiple-choicequestions.Skimorscanthemasrequiredandthenselectyouranswerstothequestions.TEXTFFirstreadthefollowingquestions.81.Accordingtothepassage,thecanalsallowed_____.A.thepreventionoffloodsB.seawatertoenterfarmlandsC.seawatertodrainfromthelandD.thelimestonetobeexposedtoair正确答案是82.Intheirnurseries,Tortugasshrimprequire_____.A.rapidlymovingwaterB.ahigh,steadywatertemperatureC.aheavyconcentrationofsaltwaterD.somefreshwatermixedwiththesaltwater正确答案是NowreadTextFquicklyandselectyouranswers.Therecordofpeople'smanipulationofnatureintheFloridaEvergladesisrepletewithexamplesofremediesthatwereneverfullyanalyzedbeforetheywereapplied--remediesthatinevitablyturnedouttobemoredisastrousthanthetroublestheywereintendedtocure.Itwaspeople'sjudgment,forexample,thattherichmuckofSouthFloridawasgoingtowasteunderwaste;sopeopledrainedoffthewateronlytodiscoverthatmuck,exposedtotheheatofthesun,oxidizesintothinair.Insomeagriculturaldistrictsnowasmuchas40percentoftheorganicsoilsaregone.Somefarmerswillbeploughinglimestonebytheyear2000.Buttheywon'tberaisinganycrops.Similarly,drainageundertakentoincreasefoodproductioninoneareahasinhibitedproductivityinanother;inperiodsofdrought,thelongcanalsbecamearmsoftheseaandsaltwaterintrudedontheland.In1945,salinityinthesoilkilledoff18,000acresofvegetablesinsoutheastDadecountry.NowincreasingsalinityinFloridaBay,causedbythedecreasingoutflowoffreshwaterfromtheEverglades,threatensthenaturaloffshorenurserygroundoftheTortugasshrimpanda'20millionannualcommercialfishery.
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