请阅读短文，完成此题。 Seventyyearsago,morethan160,000AlliedtroopsstormedthebeachesofNormandyduringtheD-Dayinvasion.AndwhileweallknowthatdayservedasahugeturningpointfortheAlliedcauseyouprobablyhaven'tthoughtmuchaboutwhatthose,soldierscarriedwiththemtoeatduringandaftertheinvasion.Foodhadtobelightweight,nutritiousandveryhighinenergy;afterall,thesemenwereabouttoinvadeNazi-occupiedland.Asithappened,theonesubstancethatcouldfulfillallthoserequirementswasaveryunlikelyitem--aHershey'schocolatebar. TheHersheychocolatecompanywasapproachedbackin1937aboutcreatingaspeciallydesignedbarjustforU.S.Armyemergencyrations.AccordingtoHershey'schiefchemistSamHinkle,theU.S.governmenthadjustfourrequestsabouttheirnewchocolatebars:theyhadtoweight4ounces,behighinenergy,withstandhightemperaturesand"tastealittlebetterthana boiledpotato".Thefinalproductwascalledthe"Drationbar",ablendofchocolate,sugar,cocoabutter,skimmilkpowderandoatflour.TheviscousmixtureprovedtoothicktomovethroughthenormalchocolatebarmanufacturingsetupattheHersheyplant,soinitiallyeachbarhadtobepackedintoits4-ouncemoldbyhand. Asfortaste,well,mostwhotrieditsaidtheywouldratherhadeatentheboiledpotato.Thecombinationoffatandoatflourmadethechocolatebaradensebrick,andthesugardidlittletomasktheoverwhelminglybittertastetothedarkchocolate.Sinceitwasdesignedtowithstandhightemperatures,thebarwasnearlyimpossibletobiteinto.Mostmenwhoateithadtoshaveslicesoffwithaknifebeforetheycouldchewit.AnddespitetheU.S.Army'sbesteffortstostopthemenfromdoingso,someoftheDrationbarsendedupinthetrash.Laterinthewar,Hersheyintroducedanewversion,knownastheTropicalbar,speciallydesignedforextremetemperaturesofthePacificTheater.Bytheendofthewar,thecompanyhadproducedmorethan3billionrationbars. But"Hitler'sSecretWeapon",asmanyinfantrymenreferredtothechocolatebar,washardlytheonlycandyintheD-Dayrations.Candywasaneasywaytopepupthetroops,andthequickburstofenergyprovidedbysugarwasawelcomeadditiontokitbags.AlongwiththeDrations,troopsreceivedthreedaysworthofKrationpacks.TheseweredevisedmoreasmealreplacementsandnotsustenancesnacksliketheDrations,andcamecompletelywithcoffee,cannedmeats,processedcheeseandtonsofsugar.Atvariouspointsduringthewar,mencouldfindpowderedorangeorlemondrink,caramels,chewinggumand--ofcourse--morechocolate.Alongwithpacksofcigarettesandsugarcubesforcoffee,theKrationpacksprovidedplentyofvaluableenergyforfightingmen. Whatisthetoneoftheauthorinwritingthearticle?__________ 查看材料
A.Ironic. B.Passionate. C.Humorous. D.Matter-of-fact.正确答案D
