[完形填空]  WhenafewcollegestudentsjokinglydeclaredNov.11aNationalSingles'Dayinthe90sinChina,theywouldneverbeabletoimaginethattheywerecreatingthebiggestonlineshoppingspreeintheworld.Itstartedasawayforyoungpeopletomakefunofthemselvesasbeingsingleandinviteothersinglefriendstohavefunatbars,restaurantsandkaraokerooms.Theychose11/11because1istheloneliestnumber,etc.Thenbusinessesbegantotakenotice.In2009,onlineretailgiantAlibabaannounceditwouldbesellingeverythingathalfpriceontaobao.comonNov.11.ItwasthefirsttimeforChinesesinglemenandwomen,andindeedmarriedpeople,too,toenjoythehugediscountsinonlineshoppingontheSinglesDay.Overthelastfewyears,Alibaba,JDandotherChinesee-commercecompaniesallexpandedtheirone-daydiscounts,andsalesgrewdramatically.In2014,AlibabaGroupscored$5.71billiononNovember11,settinganewrecordforthee-commercegiantsinceitstartedtheSinglesDaysalesfiveyearsago.Thatwasmuchhigherthanthecombined$3.7billiononlinesalesofThanksgivingDay,BlackFridayandCyberMondayfromdesktopcomputersintheU.S.A.1.In2009Alibababegantoselleverythingathalfpriceattaobao.comonNov.11.2.SomecompanieslikeAlibabaexpandedtheirtwodaysdiscountsandsalesgrewdramatically.3.In2014,Alibabascored$4.71billiononNovember11.4.ThanksgivingDayhasgotthebestselling。5.Theychose11/11because1istheloneliestnumber.