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1、Ⅰ.阅读理解Nuclearradiationhasacertainmysteryaboutit,partlybecauseitcannotbedetectedbyhumansenses.Itcan’tbeseenorheard,ortouchedortasted,eventhoughitmaybeallaroundus.Thereareotherthingslikethat.Forexample,radiowavesareallaroundusbutwecan’tdetectthem,sensethem,withoutaradi
2、oreceiver.Similarly,wecan’tsenseradioactivitywithoutaradiationdetector.Butunlikecommonradiowaves,nuclearradiationisnotharmlesstohumanbeingsandotherlivingthings.Atveryhighlevels,radiationcankillananimalorhumanbeingoutright(彻底地)bykillingmassesofcellsinimportantorgans.B
3、uteventhelowestlevelscandoseriousdamage.Thereisnolevelofradiationthatiscompletelysafe.Iftheradiationdoesnothitanythingimportant,thedamagemaynotbesignificant.Thisisthecasewhenonlyafewcellsarehit,andiftherearekilledoutright.Yourbodywillreplacethedeadcellswithhealthyone
4、s.Butifthefewcellsareonlydamaged,andiftheyreproducethemselves,youmaybeintrouble.Theyreproducethemselvesinanunusualway.Theycangrowintocancer.Sometimesthisdoesnotshowupformanyyears.Thisisanotherreasonforsomeofthemysteryaboutnuclearradiation.Seriousdamagecanbedonewithou
5、ttheknowledgeofthepersonatthetimethatdamagehasoccurred.Apersoncanbeirradiated(放射治疗)andfeelfine,thendieofcancerfive,ten,ortwentyyearslaterasaresult.Orachildcanbebornweakoreasytogetseriousillnessasaresultofradiationabsorbedbyitsgrandparents.Radiationcanhurtus.Wemustkno
6、wthetruth.[来源:学&科&网]1.Accordingtothepassage,thedangerofnuclearpowerliesin____.A.nuclearmysteryB.radiationdetectionC.radiationlevelD.nuclearradiation2.Radiationcanleadtoseriousresultsevenatthelowestlevels______.A.whenitkillsfewcellsB.ifitdamagesfewcells,andiftheyrepro
7、ducethemselvesC.thoughthedamagedcellscanrepairthemselves[来源:学§科§网]D.unlessthedamagedcellscanreproducethemselves3.Radiationcanhurtusinthewaythatitcan______.A.killlargenumbersofcellstocausedeathimmediatelyB.damagecellswhichmaygrowintocanceryearslaterC.affectthehealthyg
8、rowthofouryoungergenerationD.leadtoalloftheaboveresults4.Whichofthefollowingcanbemostlypossiblyinferredfromthepassage?A.Theimportan
