高考英语一轮复习 unit 1 great scientists单元检测卷[新人教版]必修5

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1、Unit1GreatscientistsⅠ.阅读理解Nuclearradiationhasacertainmysteryaboutit,partlybecauseitcannotbedetectedbyhumansenses.Itcan’tbeseenorheard,ortouchedortasted,eventhoughitmaybeallaroundus.Thereareotherthingslikethat.Forexample,radiowavesareallaroundusbutwecan

2、’tdetectthem,sensethem,withoutaradioreceiver.Similarly,wecan’tsenseradioactivitywithoutaradiationdetector.Butunlikecommonradiowaves,nuclearradiationisnotharmlesstohumanbeingsandotherlivingthings.Atveryhighlevels,radiationcankillananimalorhumanbeingoutr

3、ight(彻底地)bykillingmassesofcellsinimportantorgans.Buteventhelowestlevelscandoseriousdamage.Thereisnolevelofradiationthatiscompletelysafe.Iftheradiationdoesnothitanythingimportant,thedamagemaynotbesignificant.Thisisthecasewhenonlyafewcellsarehit,andifthe

4、rearekilledoutright.Yourbodywillreplacethedeadcellswithhealthyones.Butifthefewcellsareonlydamaged,andiftheyreproducethemselves,youmaybeintrouble.Theyreproducethemselvesinanunusualway.Theycangrowintocancer.Sometimesthisdoesnotshowupformanyyears.Thisisan

5、otherreasonforsomeofthemysteryaboutnuclearradiation.Seriousdamagecanbedonewithouttheknowledgeofthepersonatthetimethatdamagehasoccurred.Apersoncanbeirradiated(放射治疗)andfeelfine,thendieofcancerfive,ten,ortwentyyearslaterasaresult.Orachildcanbebornweakorea

6、sytogetseriousillnessasaresultofradiationabsorbedbyitsgrandparents.Radiationcanhurtus.Wemustknowthetruth.1.Accordingtothepassage,thedangerofnuclearpowerliesin____.A.nuclearmysteryB.radiationdetectionC.radiationlevelD.nuclearradiation2.Radiationcanleadt

7、oseriousresultsevenatthelowestlevels______.A.whenitkillsfewcellsB.ifitdamagesfewcells,andiftheyreproducethemselvesC.thoughthedamagedcellscanrepairthemselvesD.unlessthedamagedcellscanreproducethemselves3.Radiationcanhurtusinthewaythatitcan______.A.killl

8、argenumbersofcellstocausedeathimmediatelyB.damagecellswhichmaygrowintocanceryearslaterC.affectthehealthygrowthofouryoungergenerationD.leadtoalloftheaboveresults44.Whichofthefollowingcanbemostlypossiblyinferredfromthepassage?A.Theimporta