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SectionADirections:Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.PleasemarkthecorrespondingletteronAnswerSheet2withasinglelinethroughthecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.Finally,somegoodnewsaboutairplanetravel.Ifyouareonaplanewithasickpassenger,youareunlikelytogetsick.Thatisthe__26__ofanewstudythatlookedathowrespiratory(呼吸道)viruses__27__onairplanes.Researchersfoundthatonlypeoplewhowereseatedinthesamerowasapassengerwiththeflu,forexample--oronerowinfrontoforbehindthatindividual--hadahighriskofcatchingtheillness.Allotherpassengershadonlyavery__28__chanceofgettingsick,accordingtothefindings.Mediareportshavenotnecessarilypresented__29__informationabouttheriskofgettinginfectedonanairplaneinthepast.Therefore,thesenewfindingsshouldhelpairplanepassengerstofeelless__30__tocatchingrespiratoryinfectionswhiletravelingbyair.Priortothenewstudy,littlewasknownabouttherisksofgetting__31__infectedbycommonrespiratoryviruses,suchasthefluorcommoncold,onanairplane,theresearcherssaid.So,to__32__therisksofinfection,thestudyteamflewon10different__33__intheU.S.duringthefluseason.Theresearchersfoundthatpassengerssittingwithintwoseatson__34__sideofapersoninfectedwiththeflu,aswellasthosesittingonerowinfrontoforbehindthisindividual,hadaboutan80percentchanceofgettingsick.Butotherpassengerswere__35__safefrominfection.Theyhadalessthan3percentchanceofcatchingtheflu.A)accurateB)conclusionC)directlyD)eitherE)evaluateF)explorationsG)flightsH)largelyI)nearbyJ)respondK)slimL)spreadM)summitN)vividlyO)vulnerable

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对于一个有向图,若一个顶点的入度为k1,、出度为k2,则对应邻接表中该顶点单链表中的结点数为(B)。

A. k1
B. k2
C. k1+k2
D. k1-k2

个人计算机属于()类计算机。

A. 大型计算机
B. 小型机
C. 微型计算机
D. 超级计算机

下列描述中()是正确的。

A. 控制器能理解、解释并执行所有的指令及存储结果
B. 一台计算机包括输入、输出、控制、存储及算术逻辑运算五个部件
C. 所有的数据运算都在CPU的控制器中完成
D. 以上答案都正确

计算机将一部分件永恒地存于只读存储器中,称之为()。

A. 硬件
B. 软件
C. 固件
D. 助存储器

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