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1、2017公共英语五级阅读全真模拟试题 PartB Inthefollowingarticlesomeparagraphshavebeenremoved.ForQuestions66——70,choosethemostsuitableparagraphfromthelistA——Ftofitintoeachofthenumberedgaps.Thereisoneparagraphwhich"doesnotfitinanyofthegaps.MarkyouranswersonANSWERSHEET1. A
2、ccordingtotheAmericanAcademyofDermatology,anestimated10to50millionpeopleinthiscountryhaveanallergicreactiontopoisonivyeachyear.Poisonivyisoftenvery.difficulttospot.Itcloselyresemblesseveralothercommongardenplates,andcanalsoblendinwithotherplantsandweeds.Bu
3、tifyoucomeintocontactwithit,you'IIsoonknowbytheitchy,blisteryrashthatformsonyourskin.Poisonivyisared,itchyrashcausedbytheplantthatbearsitsname.Manypeoplegetitwhentheyarehikingorworkingintheirgardenandaccidentallycomeintodirectcontactwiththeplant'sleaves,ro
4、ots,orstems.Thepoisonivyrashoftenlookslikeredlines,andsometimesitformsblisters. 66. About85percentofpeopleareallergictotheurushiolinpoisonivy,accordingtotheAmericanAcademyofDermatology.Onlyatinyamountofthischemical--1billionthofagram--isenoughtocausearas
5、hinmanypeo-ple.Somepeoplemayboastthatthey'vebeenexposedtopoisonivymanytimesandhavenevergottentherash,butthatdoesn'tnecessarilymeanthey'renotallergic.Sometimestheallergydoesn'temergeuntilyou'vebeenex-posedseveraltimes,andsomepeopledeveloparashaftertheirvery
6、firstexposure.Itmaytakeuptotendaysfortherashtoemergethefirsttime. 67. Herearesomeotherwaystoidentifythepoisonivyplant.Itgenerallygrowsinaclusteroflow,weed-likeplantsorawoodyvinewhichcanclimbtreesorfences.Itismostoftenfoundinmoistareas,suchasriverbanks,wo
7、ods,andpastures.Theedgesoftheleavesaregenerallysmoothorhavetiny"teeth".Theircolorchangesbasedontheseason--reddishinthespring;greeninthesummer;andyellow,orange,orredinthefall.Itsberriesaretypicallywhite. 68. Thebody'simmunesystemisnormallyinthebusinessofp
8、rotectingusfrombacteria,viruses,andtheforeigninvadersthatcanmakeussick.Butwhenurushiolfromthepoisonivyplanttouchestheskin,itinstigatesanimmuneresponse,calleddermatitis,towhatwouldotherwisebeaharmlesssubstance
