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Scientistsbelievethediscoverycouldpavethewayforneweyetherapiesthatareaffordableandcanbedonebythepatientathome.Prof.Jefferysaid,"Usingsimplebriefexposuretolightwavelengthsthatrechargetheenergysystemwhichhasdeclinedintheretinacells,isratherlikerechargingabattery."Thetechnologyissimple,safeandverypromising.28.WhatdoesJefferyexpressinparagraph2?A.Ageaffectsthevisualsystem.B.It'snecessarytoprotecteyesight.C.Theageingpopulationisnowserious.D.Weakcolorvisionismainlycausedbyageing.29.Whatcanweknowaboutthestudyfromparagraph3?A.Researchersdidnotgetenoughdata.B.Itaimstoimprovethevisionoftheelderly.C.People'seyesightcanbeimprovedbylong-wavelightD.Participantsover40benefitedmorefromthestudy.30.Whatisthesignificanceofthisdiscovery?A.Ithelpspeoplesavemoreelectricity.B.It'spracticalandhasmedicalvalue.C.ItsavesmanyagedpeoplewithoculardiseasesD.It'sthemosteffectivetreatmentforvisionloss.31.Whereisthistextmostlikelyfrom?A.Atravelguidebook.B.Apopularnovel.C.Afashionmagazine.D.Ahealthjournal.DScientistsandengineersarepreparingforpossibletravelintointerstellar(space,theareainbetweenstars,inthedistantfuture.Anewreportexaminesthepossibleproblemofchangesinlanguageonlongspacetrips.TwoAmericanresearchershaveexploredonepossibleproblemwithsuchtravel.TheyconsideredthepossibilitythatchangesinhumanlanguagecoulddevelopovertimeandleadtomajorcommunicationproblemswithpeopleonEarth.ThelanguageexpertsareprofessorsAndrewMcKenziefromtheUniversityofKansas,andJeffreyPunskeofSouthernIllinoisUniversity.Thetworecentlypublishedapaper,whichconsidersverylongtripsnecessarytoreachinterstellarspace,estimatedtobeabout18billionkilometersfromEarth.Italsoexaminesthepossibilityoffuturecolonization(殖民地的开拓)高三英语第7页(共12页)
A.氢原子吸收B.收光子后处于n=3能级n=3氢原子从n=2n=1C.·普朗朗克常量D.h=2371.5veh=2.371.5ev=2能级跃迁到n=1能级时释放的光的频率等于2529.61一个被发二
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