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大学英语四级阅读理解试题Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yet,darkglassesornot,theyfindthemselvessufferingfromheadachesandwateringeyes,andevensnowblindness,whenexposedtoseveralhoursofsnowlight.TheUnitedStatesArmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Rather,aman'seyesfrequentlyfindnothingtofoucsoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchoftsomethingtolookat.Findingnothing,hourafterhour,theeyesneversotpsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblurs,thenisobsured,andtheresultistotal,eventhoughtemporary,snowblindness.ExperimentsledtheArmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushes,creatingadottedlineastheycrosscompletelysnow-coveredlandscape,Eventhescoutsthemselvesthrowlightweight,darkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtosee,stopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatime,themencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome.1.Topreventheadaches,wateringeyesandblindnesscausedbytheglarefromsnow,darkglassesare_____.a.indispensibleb.usefulc.ineffectived.available2.Whentheeyesaresoretearsareproducedto________.a.clearthevisionb.remedysnowblindnessc.easetheirritationd.loosenthemuscles3.Snowblindnessmaybeavoidedby_______.a.concentratingtothesolidwhiteterrainb.searchingforsomethingtolookatinsnow-coveredterrainc.providingtheeyeswithsomethingtofoucsond.coveringtheeyeballswithfluid4.Thescoutsshakesnowfromevergreenbushesinorderto_______.a.bivethemenbehindsomethingtoseeb.beautifythelandscapec.warmthemselvesinthecoldd.preventthemenbehindfromlosingtheirway5.Asuitabletitleforthispassagewouldbe_______.a.snowblindnessandhowtoovercomeitb.natrue'scureforsnowblindnessc.soldiersinthesnowd.snowvision18/200答案：CCCAA