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第1页共7页课堂练习54阅读理解（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给出的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。AAman,whosometimestakesmybus,isinrags.Hislifeseemsdifferentfromthatoftheothers.Helooksexhaustedandcarriesnothing.Heappearsalongadowntownstreet,seeminglyoutofnowhere.Wesometimeswanttoknowwherehesleepsatnight.Afewweeksagoheboardedthebus.Afewstopslater,ayoungwomanboarded.Sheswiped(刷)herbus-card,onlytofindthemachinewouldnotacceptit.Thedrivertoldhertopaythe$2.25fare.“Ijustboughtthiscard,”shesaid.“Ipaidthemoney...”[来源:Z.xx.k.Com]Thedriversaidshecouldtakethecardbacktothesalesofficeandexplaintheproblem.Inthemeantimeshewouldhavetopaythefareforthatday.Thewomanbecameconfusedanddistressed.Therestofusjustwatched,wonderinghowtheproblemwouldbesolved.Suddenlythemanrosefromhisseat,droppedafewcoinsintothefarebox.“You’relucky,”thebusdriversaidquietly.“Hepaidforyou.”Silencefelloverthebus.Therestofushadwatchedthewoman’sdiscomfort,buthefeltit.Welawyers,journalistsandbusinesspeopleheadeddowntowntohelpfixtheworld.Hefixedherworld.Ihaven’tseenhimsincethatday.Somepeoplebelieveangelsoccasionallydropdownandmoveamongus.AllIknowisthatIhaveanewrespectforthesimpleactofkindness.Itspeedsusalongonourway.41.Accordingtothefirstparagraph,theauthor_______.A.thinkshighlyofthemanB.oftengivesthemansomehelpC.knowsthemanverywellD.considersthemanstrange42.Whatdoestheunderlinedword“distressed”probablymean?A.exitedB.generousC.boredD.anxious43.Whatdidthewriterlearnfromtheman?A.toshowconcernforotherpeople.B.toleadahappylifeliketheman.C.tosharewhathehaswithus.D.tobelievethatpeoplearebornkind.BHowtheGrandCanyon(大峡谷)wascreatedremainsoneofthegeology’sgreatestmysteries.SomeevidencesuggeststhattheprocesswasagradualoneinwhichtheColoradoRiver(whichrunsthroughthecanyon)slowlycutdeeperanddeeperintothegroundovermillionsofyears.Butvolcanicrocksamplestakenfromthecanyonnowsuggestthatthecanyonwasdown-cutinstead.Down-cuttingiswhenafloodofwaterrushesoveralandscape(地形)withenoughforcetocutdeeplyintothegroundandleavesbehindacanyon.Suchafloodisusuallyreleasedwhenanaturalorman-madedam(堤坝)bursts.RobertWebb,aresearchgeologist,saysnaturaldamsseemtohaveformedandbrokenacrossthe第2页共7页ColoradoRiverseveraltimesduringthelastmillionyears.Thedamswerebuiltwhenlava(熔岩)fromtheeruptionsofnearbyvolcanoesflowedintotheriver.Thelavahardenedintohardrocksandblockedtheriver,causingittobackupandformalake.Eachtimethelakegrewsohugethatitbroketherockdam,releasingaflashfloodthatfurtheredthedown-cuttingprocessanddeepenedthecanyon.Down-cuttingisnotjustanearthlyevent.SatellitephotossentbackfromMarssuggestthattheprocesshashappenedthere,too,saymanyotherresearchers.Thephotos,takenbytheMarsGlobalSurveyor,indicatethatanenormouslakeexistedonMars3.5billionyearsago.Thelakespilledintoalargenearbyhole.Oneedgeoftheholebroke,releasingaflashfloodthatquicklycarvedoutagrandcanyon.Theexistenceofdown-cuttingonMarsisjustonemorepieceofevidencethatthecold,dryplanetwasoncewarmandwet.44.Inthepast,deepcanyonswerebelievedtohaveformed_______.A.asaresultofasuddenbreakofvolcanoesB.duetoriverflowsovermillionsofyearsC.owingtotheburstofartificialdamsD.thankstoourancestors’creativework45.Accordingtothepassage,whichofthefollowingstatementsisTURE?A.SeveralvolcanoesbrokeoutonMarsdirectlycreatinggrandcanyons.B.SeveralgreatlakesexistedontheupperpartsoftheColoradoRiver.C.PeoplebuilthighdamsontheupperpartsoftheColoradoRiver.D.TheColoradoRivercrossedtheGrandCanyontoformdown-cutting.46.Fromthelastthreeparagraphswelearnthat_______.A.therearegreatlakesonMarsB.thereareactivevolcanoesonMarsC.theremightbecitiesonMarsD.theremightbelifeonMars47.Thepassagecanbetitledas_______.A.LakesonEarthandMarsB.TheCauseofLakeFormationC.TheForceofDamBreakingD.Canyons—ResultsofFloodCutting[来源:学#科#网]CTeenClimbingCamp2010This5-dayclimbingcampissuitableforteenagersbetweentheagesof13and18whohaveaninterestinrockclimbing.Theclimbingdaysaredesignedforbeginnersandthosewhohavesomebasicexperienceinagymoroutdoors.Participantswillfindthemselveschallengedphysicallyandmentally.RockDimensionscampsaredesignedtobeapositiveandmemorableexperiencebyprovidinghealthycommunicationbetweenparticipants,individualgoalsetting,andchallengesthatleadtopersonalgrowth.DatesMonday,June29-Friday,July3Monday,July27-Friday,July31LocationsClimbingToweratFootsloggersLinvilleGorgeandTableRockarea第3页共7页LocalclimbingareasnearBooneResponsibilitiesParticipantswillmeetRockDimensionsguidesatourlocationeachmorningandattheendofeachday.RockDimensionswillprovideallclimbingitems,includingasafetyrope,ahelmetandclimbingshoesforeachparticipant.Participantsareresponsibleforbringingtheirownlunch,water,smallbackpack,appropriateclothing,andpersonalitemslikesuncream,etc.Pre-campplanningParticipantswillreceivethefollowinginformationintheirregistration(注册)packetMedicalForm,ResponsibilityAgreement,Clothing/EquipmentList,andDirections.Cost$575/personforthe5-daycamp$325/personforthefirst3daysAnyoneinterestedinparticipatinginjustthelasttwodaysofthecampshouldcalltodiscusspricingandnecessaryskills/experience.48.Accordingtothetext,RockDimen