Что обозначают следующие сокращения : PC , DDC, MTV , UNESCO.CNN , UK, USA, the UFO , NATO , CD, IQ, OK.?

PC - personal computer, the BBC - the British Broadcasting Corporation, MTV - Music Television, UNESCO - United Nations Educational, Scientific, and Cultural Organization, CNN - Cable News Network, the UK - the United Kingdom , the USA - the United States of America, the UFO - unidentified flying object, NATO - North Atlantic Treaty Organization, CD - compact disc, IQ - intelligence quotient, OK - okay.