高考英语第一轮复习单元检测卷22

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1、www.ks5u.comⅠ.阅读理解Nuclearradiationhasacertainmystery，partlybecauseitcannotbedetectedbyhumansenses.Itcan'tbeseenorheard，ortouchedortasted，eventhoughitmaybeallaroundus.Thereareotherthingslikethat.Forexample，radiowavesareallaroundusbutwecan'tdetectthem，sensethem，withoutaradioreceiver.

2、Similarly，wecan'tsenseradioactivitywithoutaradiationdetector.Butunlikecommonradiowaves，nuclearradiationisnotharmlesstohumanbeingsandotherlivingthings.Atveryhighlevels，radiationcankillananimalorhumanbeingoutright(彻底地)bykillingmassesofcellsinimportantorgans.Buteventhelowestlevelscand

3、oseriousdamage.Thereisnolevelofradiationthatiscompletelysafe.Iftheradiationdoesnothitanythingimportant，thedamagemaynotbesignificant.Thisisthecasewhenonlyafewcellsarehit，andwhentheyarekilledoutright，yourbodywillreplacethedeadcellswithhealthyones.Butifthefewcellsareonlydamaged，andwhe

4、ntheyreproducethemselves，youmaybeintrouble.Theyreproducethemselvesinanunusualway.Theycangrowintocancer.Sometimesthisdoesnotshowupformanyyears.Thisisanotherreasonforsomeofthemysteryaboutnuclearradiation.Seriousdamagecanbedonewithouttheknowledgeofthepersonatthetimethatdamagehasoccurr

5、ed.Apersoncanbeirradiated(放射治疗)andfeelfine，thendieofcancerfive，ten，ortwentyyearslaterasaresult.Orachildcanbebornweakoreasytogetseriousillnessasaresultofradiationabsorbedbyitsgrandparents.Radiationcanhurtus.Wemustknowthetruth.语篇导读核辐射对人类和一切生物都有影响，我们必须正视。1．Accordingtothepassage，thedan

6、gerofnuclearpowerliesin________.A．nuclearmysteryB．radiationdetectionC．radiationlevelD．nuclearradiation解析：D　细节理解题。根据文章第二段的前面几句“…eventhelowestlevelscandoseriousdamage…”可知答案为D项。2．Radiationcanleadtoseriousresultsevenatthelowestlevels________.A．whenitkillsfewcellsB．ifitdamagesfewcells，a

7、ndiftheyreproducethemselvesC．thoughthedamagedcellscanrepairthemselvesD．unlessthedamagedcellscanreproducethemselves解析：B　细节理解题。由第二段倒数第三、四句可知答案选B项。3．Radiationcanhurtusinthewaythatitcan________.A．killlargenumbersofcellstocausedeathimmediatelyB．damagecellswhichmaygrowintocanceryearslate

8、rC．affectthehealthygrowtho