PartIIPartIIISectionAListeningComprehension(30minutes)�L<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<����j;lji�a]��A����������n��m-��n���m-��m=���-��V�"'.)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>,�ReadingComprehension(40minutes)Directions:Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethroughthecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.Steelisvaluedforitsreliability,butnotwhenitgetscold.Mostformsofsteel26becomebrittle(Jlliav)attemperaturesbelowabout-25°Cunlesstheyaremixedwithothermetals.Now,though,anoveltypeofsteelhasbeendevelopedthatresists27atmuchlowertemperatures,whileremainingitsstrengthandtoughness-withouttheneedforexpensive28Steel'sfragilityatlowtemperaturesfirstbecameamajorconcernduringtheSecondWorldWar.AfterGermanU-boatstorpedoed(Jflit1':i:k¾)numerousBritishships,a2700-strongfleetofcheapand-cheerful"Libertyships"wasintroducedtoreplacethelostvessels,providingalifelineforthe29British.Butthesteelshellsofhundredsoftheships30intheicynorthAtlantic,and12brokeinhalfandsank.Brittlenessremainsaproblemwhenbuildingsteelstructuresincoldconditions,suchasoilrigsintheArctic.Soscientistshave31tofindasolutionbymixingitwithexpensivemetalssuchasnickel.YuujiKimuraandcolleaguesinJapantriedamorephysical32.Ratherthanaddingothermetals,theydevelopedacomplexmechanicalprocessinvolvingrepeatedheatingandveryseveremechanicaldeformation,knownastempforrning.Theresultingsteelappearstoachieveacombinationofstrengthandtoughnessthatis33tothatofmodemsteelsthatareveryrichinalloycontentand,therefore,veryexpensive.Kimura'steamintendstouseitstempformedsteeltomakeultra-highstrengthparts,suchasbolts.Theyhopetoreduceboththenumberof34neededinaconstructionjobandtheirweight-...
