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1、Nuclearpower’s(核能的)dangertohealth,safety,andevenlifeitselfcanbedescribedinoneword;radiation(辐射). Nuclearradiationhasacertainmysteryaboutit,partlybecauseitcannotbedetected(探测)byhumansenses.Itcan’tbeseenorheard,ortouchedortasted,eventhoughitmaybeallaroundus.Thereare
2、otherthingslikethat.Forexample,radiowavesareallaroundusbutwecan’tdetectthem,sensethem,withoutaradioreceiver.Similarly,wecan’tsenseradioactivitywithoutaradiationdetector.Butunlikecommonradiowaves,nuclearradiationisnotharmlesstohumanbeingsandotherlivingthings. Atver
3、yhighlevels,radiationcankillananimalorhumanbeingbykillingmassesofcells(细胞)inimportantorgans(器官).Buteventhelowestlevelscandoseriousdamage.Thereisnolevelofradiationthatiscompletelysafe.Iftheradiationdoesnothitanythingimportant,thedamagemaynotbeserious.Thisisthecasewh
4、enonlyafewcellsarehit,andiftheyarekilledcompletely,yourbodywillreplacethedeadcellswithhealthyones.Butifthefewcellsareonlydamaged,andiftheyreproducethemselves,youmaybeintrouble.Theyreproducethemselvesinanunusualway.Theycangrowintocancer.Sometimesthisdoesnotshowupfor
5、manyyears. Thisisanotherreasonforsomeofthemysteryaboutnuclearradiation.Seriousdamagecanbedonewithouttheknowledgeofthepersonatthetimethatdamagehasoccurred.Apersoncanbeirradiated(放射治疗)andfeelfine,thendieofcancerfive,ten,ortwentyyearslaterasaresult.Orachildcanbebornw
6、eakoreasytogetseriousillnessasaresultofradiationabsorbed(吸收)byitsgrandparents. Radiationcanhurtus.Wemustknowthetruth.59.Accordingtothepassage,thedangerofnuclearpowerliesin__________. A.nuclearmystery B.radiationdetection C.radiationlevel D.nuclearradiation60.Ra
7、diationcanleadtoseriousresultsevenatthelowestlevel________. A.whenitkillsfewcells B.ifitdamagesfewcells C.thoughthedamagedcellscanrepairthemselves D.unlessthedamagedcellscanreproducethemselves61.Radiationcanhurtusinthewaythatitcan_____. A.killlargenumbersofcel
8、lsinmainorganssoastocausedeathimmediately B.damagecellswhichmaygrowintocanceryearslater C.affectthehealthygrowthofouryoungergeneration D.leadt
