Wikipediaisanonlinefreeencyclopedia．Therearemorethan38millionarticlesaboutsociety，history，culture，music，science，technology，geographyandsoon．Onthiswebsite，peoplecanfindarticlesaboutalmosteverythingintheworld．Wikipediahasalsodeveloped292languageversionsforpeopletoreadintheirownlanguages．
JimmyWalesandLarrySangerstartedthisencyclopediaprojecton9thMarch，2000．ItwascalledNupediaatfirst．andallthearticleswerewrittenandcheckedbyexperts．Walesthoughtthatthewebsitcshouldbeaplacewhereitsuserscouldnotonlyfindinformationbutalsosharewhattheyknew．Sotheytriedtouseawikisysten（wikiisaHawaiianword"weekeeweekee"whichfirstlymeant"quick"）．On10thJanuary，2001，theybegananewprojecttoimproveNupedia．On15thJanuary.2001，thenewonlineencyclopedianamedWikipediawassetup．Wikipediaachievedagreatsuccess．
AccordingtotheAlexaTrafficRankreporton22ndMay，2016，Wikipediaistheseventhmostpopularwebsiteintheworld．Everysingleuserhelpstomakethispopularfreeencyclopedia．
26．Wikipediais___．
A．abook
B．alibrary
C．areport
D．awebsite
27．Wikipediawassetupon___．
A.9thMarch，2000
B.10thJanuary，2001
C.15thJanuary，2001
D.22ndMay，2016
28．WhatcanpepoleuseWikipediatodo？___
A．Toreadnovels．
B．Tosearchforinformation
C．Tolistentomusic．
C．ToreadAlexaTrafficRank．