阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。The2012LondonOlympicshadenoughproblemstoworryabout.Butonemorehasjustbeenadded—acommunicationsblackoutcausedbysolarstorms.AfteraperiodofcalmwithintheSun,scientistshavedetectedthesignsofafreshcycleofsunspotsthatcouldpeakin2012,justintimeforthearrivaloftheOlympictorchinLondon.NowscientistsbelievethatthispeakcouldresultinvastsolarexplosionsthatcouldthrowbillionsoftonsofchargedmattertowardstheEarth,causingstrongsolarstormsthatcouldjamthetelecommunicationssatellitesandinternetlinkssendingliveOlympicbroadcastfromLondon.“TheSun’sactivityhasastronginfluenceontheEarth.TheOlympicscouldbeinthemiddleofthenextsolarmaximumwhichcouldaffectthefunctionsofcommunicationssatellites,“saidProfessorRichardHarrison,headofspacephysicsattheRutherfordAppletonLaboratoryinOxfordshire.Atthepeakofthecycle,violentoutburstscalledcoronalmassejections(日冕物质抛射)occurintheSun’satmosphere,throwingoutgreatquantitiesofelectrically-chargedmatter.“Acoronalmassejectioncancarryabilliontonsofsolarmaterialintospaceatoveramillionkilometresperhour.Sucheventscanexposeastronautstoadeadlyamount,candisablesatellites,causepowerfailuresonEarthanddisturbcommunications,”ProfessorHarrisonadded.Theriskisgreatestduringasolarmaximumwhenthereisthegreatestnumberofsunspots.NextweekinAmerica,NASAisscheduledtolaunchasatelliteformonitoringsolaractivitycalledtheSolarDynamicsObservatory(SDO),whichwilltakeimagesoftheSunthatare10timesclearerthanthemostadvancedtelevisionsavailable.TheRutherfordAppletonLaboratoryhelpedtomakethehigh-techcamerasthatwillcaptureimagesofthesolarflares(太阳耀斑)andexplosionsastheyoccur.ProfessorRichardHoldaway,thelab’sdirector,saidthattheSDOshouldbeabletoprovideearlywarningofasolarflareorexplosionbigenoughtoaffectsatellitecommunicationsonEarth.“Ifwehaveadvancewarning,we’llbeabletoreducethedamage.Whatyoudon’twantisthingsswitchingoffforaweekwithnoideaofwhat’scausedtheproblem,”hesaid.1.Thephrase“communicationsblackout”inParagraph1mostprobablyreferstoduringthe2012Olympics.A