题目内容：
Questionsarebasedonthefollowingpassage.
Middleagedmenwhodrink2．5drinksperdaymayacceleratememorylossbysixyears，accordingtoanewstudy．
ResearchersfromUniversityCollegeLondonintheUKassessedthedrinkinghabitsof5．054menand2．099womenatthreedifferenttimesoveratenyearperiod．Whentheparticipantsturned56，theytookthefirstofthreetestsoftheirmemoryandexecutivefunctionoverthenextloyears．
TheyreportinthejournalNeurologythatmenwhodownedanaverageof2.5drinksperdayshowedsignsofmemorylosssoonerthanmenwhodidn'tdrinkormenwhowerelightertomoderatedrinkers.Evenaftertheycontrolledformemory-affectingfactorssuchastheirdietandexercisehabitsandoccupation,theconnectionheld.Theresearchersdidn'tfindasimilartrendamongwomen,althoughtheheavierdrinkingwomendidshowdeficitsinorganizationandplanningskills.
Adrinkwasclassifiedasbeer,wineorliquor,andwhilethoseardentspirits(烈性酒)likevodka(伏特加酒),ginorwhiskeyshowedthefastestdeclines,theredidn'tappeartobeanydifferencesinmemorylossamongthosedrinkingbeerorwine.
It'snotthefirststudytodocumentthenegativeeffectthatdrinkingcanhaveoncognitive(认知的)functions.Butitisamongthefirsttolookatitseffectsstartinginyounger,middleagedpeople.Anditdemonstratedhowlittlealcoholittakestoaffecthigherorderfunctionslikememory.AccordingtotheNationalInstituteonAlcoholAbuseandAlcoholism,formen,drinkinguptofourdrinksadayisconsideredlowriskdrinking,whileuptothreedrinksdailyisconsideredlowriskforwomen.Whenmeasuringpotentialhealthrisksassociatedwithdrinking,theCentersforDiseaseControlsaysmoderateconsumptioninvolvesuptotwodrinksdailyformenandonealcoholicbeverageadayforwomen.
Theresearchersspeculatethatalcoholsomehowinterfereswithbloodflowtothebrain.Previousstudiesshowedthatexcessivedrinkingcanalsodamagenervecellsthatcanaffectthebrain'scognitivefunctions,buttheselatestfindingssuggestthattheharmmaybeginsoonerthanexpertshadthought--andlastlongerthantheyhadexpectedaswell.
Whatdoweknowaboutthenewstudyaccordingtothefirsttwoparagraphs? A．ThestudywasconductedbyresearchersfromtheUS.
B．Thestudyshoweddrinkingcanleadtomemoryloss.
C．Theparticipantswereallmiddleagedmen.
D．Theparticipantstookthefirsttestaboutmemoryattheageof56.
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