2016年6月英语四级考试：仔细阅读练习(1)思维导图
Newspapers often tell us of floods in some parts of the United States. Nearly every year on the great central drainages heavy rains and melting snow cause the waters to pour o
树图思维导图提供 2016年6月英语四级考试：仔细阅读练习(1) 在线思维导图免费制作，点击“编辑”按钮，可对 2016年6月英语四级考试：仔细阅读练习(1) 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：27ee6e318985064e6b2fb947fb876c75
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2016年6月英语四级考试：仔细阅读练习(1)思维导图模板大纲
NewspapersoftentellusoffloodsinsomepartsoftheUnitedStates.
Nearlyeveryyearonthegreatcentraldrainagesheavyrainsandmeltingsnowcausethewaterstopouroutthemountainsandplains,toturnbrooksintotorrents,andtoswellquietstreamsintowilduncontrolledrivers.FromCairotoNewOrleans,andfromPittsburghtoPaducah,thecry"Riverrising!"isafamiliaryetfearfulvoice...Whentheriverssometimesbecometoohighortooswifttobecontrolledcommunitiesareflooded,familiesfleefromtheirhomes,croplandsarewashedout,andtransportationcomestoahalt.Hunger,disease,anddeathfollowthewildwaters.
Althoughgivenlesspublicity,theagriculturaldamagedonebythemanysmaller,morefrequentfloodsusuallyfarexceedsthelossescausedbytheverygrandones.IntheCentralStates,ditchesanddrainscausetheflowsfromspringrainsandmeltingsnowtorunfarmorerapidlythaninthedaysbeforewhitemensettledontheland.Once,excessspringfloodwatersemptiedintolakesandswampylands,theretobedetainedforslowreleaseintostreamandrivers.Now,systematicdrainagehasactuallyeliminatedthesenaturalreservoirs.
InthemorerollingsectionsoftheEast,springrunoffwasformerlyabsorbedandheldtemporarilyintheporoussoilsbeneaththeunbrokenexpanseofforest.Whenlargeareaswereconvertedtofarmuse,removaloftheforestandthepracticeofup-and-downhillplowingdeprivedthesoilsofmuchoftheirabilitytocatchandstorewater.
Theeffectsofeliminatingthenaturalforestcoverareshowninthegulliedfarmlandsandwidenedstreamchannelsfoundinsomedenselysettledareas.Partlybecausethestreamchannelsaremoreorlessfilledwithmaterialwasheddownfromtheuplands,andpartlybecausestormrunoffhasincreased,thechannelsaretodaynolongerabletocarryalltheflowfromheavyrains.Thisexplainswhythestreamsovertopbanksfarmoreoftenthaninthedaysbeforesettlement.
26.Thebesttitlefortheselectionwouldbe______.
A.RiverRising!RiverRising!B.ForestsandFloods
C.FloodingintheU.S.D.TheResultsofFlooding
27.AllofthefollowingcausefloodsEXCEPT______.
A.heavyrainB.meltingsnow
C.increasingstormrunoffD.poroussoil
28.Theauthorstatesthat______.
A.lakesandswampsonceactedlikenaturalreservoirs
B.up-and-downhillplowingcatchesandstoreswater
C.streamchannelsarethebestcarriersofwater
D.floodsareeasilypreventedandcontrolled
29.Accordingtotheselection,streamsovertoptheirbankspartlybecause______.
A.materialfromhigherlandiswashedintothem
B.ditchesanddrainsleadintothem
C.riversbecometooswift
D.snowmeltsmorerapidlynowadays
30.Thefloodswhicharegivenmostpublicity______.
A.causenodamage
B.causethemostdamage
C.causelessagriculturaldamagethanthemanysmaller,morefrequentfloods
D.farexceedthesmaller,morefrequentfloodsinagriculturalloss
答案：26.C27.D28.A29.A30.C
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