小编为备考的同学们整理了2019年读练习题，希望可以为大家带来帮助，预祝大家高分通过。

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.ForestsandFloodsC.FloodingintheU.S.D.TheResultsofFlooding

27.AllofthefollowingcausefloodsEXCEPT______.

A.heavyrainB.meltingsnowC.increasingstormrunoffD.poroussoil

28.Theauthorstatesthat______.

A.lakesandswampsonceactedlikenaturalreservoirsB.up-and-downhillplowingcatchesandstoreswaterC.streamchannelsarethebestcarriersofwaterD.floodsareeasilypreventedandcontrolled

29.Accordingtotheselection,streamsovertoptheirbankspartlybecause______.

A.materialfromhigherlandiswashedintothemB.ditchesanddrainsleadintothemC.riversbecometooswiftD.snowmeltsmorerapidlynowadays

30.Thefloodswhicharegivenmostpublicity______.

A.causenodamageB.causethemostdamageC.causelessagriculturaldamagethanthemanysmaller,morefrequentfloodsD.farexceedthesmaller,morefrequentfloodsinagriculturalloss

答案：26.C27.D28.A29.A30.C