阅读理解Nuclearpower'sdangertohealthsafetyandevenlifeitselfcanbesummedupinoneword：radiation．Nuclearradiationhasacertainmysteryaboutitpartlybecauseitcanno

　　阅读理解

　　Nuclearpower'sdangertohealthsafetyandevenlifeitselfcanbesummedupinoneword：radiation．

　　Nuclearradiationhasacertainmysteryaboutitpartlybecauseitcannotbedetectedbyhumansenses．Itcan'tbeseenorheardortouchedortastedeventhoughitmaybeallaroundus．Thereareotherthingslikethat．Forexampleradiowavesareallaroundusbutwecan'tdetectthemsensethemwithoutaradioreceiver．Similarlywecan'tsenseradioactivitywithoutaradiationdetector．Butunlikecommonradiowavesnuclearradiationisnotharmlesstohumanbeingsandotherlivingthings．

　　Atveryhighlevelsradiationcankillananimalorhumanbeingoutright(全部地)bykillingmassesofcellsinvitalorgans．Buteventhelowestlevelofradiationcandoseriousdamage．Thereisnolevelofradiationthatiscompletelysafe．Iftheradiationdoesnothitanythingimportantthedamagemaynotbesignificant．Thisisthecasewhenonlyafewcellsarehitandiftheyarekilledoutrightyourbodywillreplacethedeadcellswithhealthyones．Butifthefewcellsareonlydamagedandiftheyreproducethemselvesyoumaybeintrouble．Theyreproducethemselvesinadeformedway．Theycangrowintocancer．Sometimesthisdoesnotshowupformanyyears．

　　Thisisanotherreasonforsomeofthemysteryaboutnuclearradiation．Seriousdamagecanbedonewithoutthevictimbeingawareatthetimethatdamagehasoccurred．Apersoncanbeirradiated(照射)andfeelfinethendieofcancerfivetenortwentyyearslaterasaresult．Orachildcanbebornweakorliable(易于)toseriousillnessasaresultofradiationabsorbedbyitsgrandparents．

　　Radiationcanhurtus．Wemustknowthetruth．

　　(1)

　　Accordingtothepassagethedangerofnuclearpowerliesin________．

　　[]A．

　　nuclearmystery

　　B．

　　radiationdetection

　　C．

　　nuclearradiation