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第PAGE\*MERGEFORMAT2页共NUMPAGES\*MERGEFORMAT2页 2021年6月大学英语四级真题文章原文听写(1) Therearemanycommonlyheldbeliefsabouteyeglassesandeyesightthatarenotprovenfacts.Forinstance,somepeoplebelievethatwearingglassestoosoonweakenstheeyes.Butthereisnoevidencetoshowthatthestructureofeyesischangedbywearingglassesatayoungage.Wearingthewrongglasses,however,canproveharmful.Studiesshowthatforadultsthereisnodanger,butchildrencandeveloplossofvisioniftheyhaveglassesinappropriatefortheireyes.Wehaveallheardsomeofthecommonmythsabouthoweyesightgetsbad.Mostpeoplebelievethatreadingindimlightcausespooreyesight,butthatisuntrue.Toolittlelightmakestheeyesworkharder,sotheydogettiredandstrained.Eyestrainalsoresultsfromreadingalot,readinginbed,andwatchingtoomuchtelevision.However,althougheyestrainmaycausesomepainorheadaches,itdoesnotpermanentlydamageeyesight.Anothermythabouteyesisthattheycanbereplaced,ortransferredfromonepersontoanother.Thereareclosetoonemillionnervefibresthatconnecttheeyeballtothebrain,asofyetitisimpossibletoattachthemallinanewperson.Onlycertainpartsoftheeyecanbereplaced.Butifwekeepclearingupthemythsandlearningmoreabouttheeyes,somedayafulltransplantmaybepossible.
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