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单元加餐练(五)Ⅰ.阅读理解Areyouatleast17yearsold?Doyouweighmorethan110pounds?Doyouconsideryourselffairlyhealthy?Ifyouansweredyestoallofthesequestions,youshouldbedonatingbloodeverytwomonths.Inmysurveyofmyschoolmates,Ifoundthatonly50percentofthemhaveeverdonatedbloodandthatonly1outof13ofthemdonateregularly.Thelackofblooddonorsisaseriousproblemthatrequiresimmediateaction.AccordingtotheAmericanRedCrossWebpages,intheUnitedStatesalonesomeonereceivesabloodtransfusion(输血)onceeverythreeseconds.Peoplewhobenefitfromdonationsincludecancerpatientsaswellasbabies.Theneedforbloodnevertakesavacationandneithershoulddonors.LetmetellyouaboutBrooke,athreeyearoldgirlwithcancer.Brookehasspentabouthalfofherlifeinthehospitalreceivingtreatments.Hertreatmentwillrequireabout500unitsofbloodintotal,ofwhichonly250unitshavebeenreplaced.Shestillneedstheotherhalfofthetotalamounttocontinuehertreatment.Ifshedoesn'treceivethisblood,shewillnotlivetostartkindergarten.ExampleslikeBrooke'sarebecomingalltoocommonthesedays,withonly1in20Americansdonatingbloodandthisnumberkeepsdroppingeachyear.Thesefactsareextremelyworryingconsideringthatnearlyhalfofusherewillneedbloodsometimeinourlives.Youcannowseetheseriousnessoftheproblemwiththelackofblooddonations.Fortunately,itisaproblemthatcanbeeasilysolved.Eachandeveryoneofyoucanbepartofthesolution.AllyouhavetodoisgotothenearestRedCrossanddonateyourblood.语篇解读：本文是一篇议论文。文章主要论述了义务献血的紧迫性。1．HowdoestheauthorexplaintheproblemmentionedinParagraph2?A．Byansweringquestions.B．Bymakingcomparisons.C．Bypresentingresearchfindings.D．Bydescribinghisownexperiences.解析：选C写作手法题。根据第二段中的Inmysurveyofmyschoolmates,Ifoundthat可知，作者在第二段主要是通过陈述自己的调查发现来解释说明献血者少这一问题。2．WhatcanwelearnfromtheAmericanRedCrossWebpages?A．Thesufferingofpatients.B．Thestrongneedforblood.C．TheeffortsoftheRedCross.D．Thebenefitsoftakingvacations.解析：选B推理判断题。根据第三段中的intheUnitedStatesalonesomeonereceivesabloodtransfusion(输血)onceeverythreeseconds和Theneedforbloodnevertakesavacation不难看出市场对血液的强烈需求。3．Whatisthepurposeofthetext?