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XX全国英语四级阅读模拟习题及答案xx全国英语四级阅读模拟习题及答案 Many peoplebelieve theglare fromsnow causessnowblindnenss.Yet,dark glassesor not,they findthemselves sufferingfrom headachesand wateringeyes,and evensnowblindness,when exposedto severalhours ofsnow light. The UnitedStates Armyhas nowdetermined thatglare fromsnow doesnot causesnowblindness introops ina snow-covered country.Rather,a manseyes frequentlyfind nothingto foucson ina broadexpanse ofbarren snow-covered terrain.So hisgaze continuallyshifts andjumps backand forthover theentire landscapein searchof tsomethingto lookat.Finding nothing,hour afterhour,the eyesnever sotpsearching and the eyeballsbee soreand theeye musclesache.Nature offsetsthis irritationby producingmore andfluid whichcovers theeyeball.The fluidcoversthe eyeballin increasingquantity untilvision blurs,then isobsured,andtheresult istotal,even thoughtemporary,snowblindness. Experiments ledthe Armyto...。