If you mean the original World of Warcraft, yes. Just buy the first CD and play like that, however you can only get to level 60 until you buy further expansions.
- You can't visit Outland or Northrend
- You can't visit Azuremyst Isle, Bloodmyst Isle, Exodar, Eversong Woods, Ghostlands, or Silvermoon City.
- You can't play a bloof elf or draenei.
- You can't play a paladin as Horde or a shaman as Alliance.
- Learn Jewelcrafting or Inscription.
- You can't get or learn to fly a flying mount.
- Many of the achievements require you to be above level 60.