Nuclearpower'sdangertohealthsafetyandevenlifeitselfcanbedescribedinoneword;radiation(辐射).
Nuclearradiationhasacertainmysteryaboutitpartlybecauseitcannotbedetected(探测)byhumansenses.Itcan'tbeseenorheardortouchedortastedeventhoughitmaybeallaroundus.Thereareotherthingslikethat.Forexampleradiowavesareallaroundusbutwecan'tdetectthemsensethemwithoutaradioreceiver.Similarlywecan'tsenseradioactivitywithoutaradiationdetector.Butunlikecommonradiowavesnuclearradiationisnotharmlesstohumanbeingsandotherlivingthings.
Atveryhighlevelsradiationcankillananimalorhumanbeingcompletelybykillingmassesofcellsinimportantorgans(器官).Buteventhelowestlevelscandoseriousdamage.Thereisnolevelofradiationthatiscompletelysafe.Iftheradiationdoesnothitanythingimportantthedamagemaynotbesignificant.Thisisthecasewhenonlyafewcellsarehitandiftheyarekilledcompletely.Yourbodywillreplacethedeadcellswithhealthyones.Butifthefewcellsareonlydamagedandiftheyreproducethemselvesyoumaybeintrouble.Theyreproducethemselvesinanunusualway.Theycangrowintocancer.Sometimesthisdoesnotshowupformanyyears.
Thisisanotherreasonforsomeofthemysteryaboutnuclearradiation.Seriousdamagecanbedonewithouttheknowledgeofthepersonatthetimethatdamagehasoccurred.Apersoncanbeirradiated(放射治疗)andfeelfinethendieofcancerfivetenortwentyyearslaterasaresult.Orachildcanbebornweakoreasytogetseriousillnessasaresultofradiationabsorbedbyitsgrandparents.
Radiationcanhurtus.Wemustknowthetruth.
Accordingtothepassagethedangerofnuclearpowerliesin__________.
A.nuclearmystery B.radiationdetection
C.radiationlevel D.nuclearradiation
Radiationcanleadtoseriousresultsevenatthelowestlevel________.
A.whenitkillsfewcells B.ifitdamagesfewcells
C.thoughthedamagedcellscanrepairthemselves
D.unlessthedamagedcellscanreproducethemselves
Radiationcanhurtusinthewaythatitcan_____.
A.killlargenumbersofcellsinmainorganssoastocaus
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