这些英文简写的英文全称是什么

UN United Nations
WHO World Health Organizatin
OPEC Organization of Petroleum Exporting Countries
OECD organization for economic cooperation and development
NATO North Atlantic Treaty Organization
UK United Kingdom
GNP Gross National Product
ITT International Telephone and Telegraph Corporation
FBI Federal Bureau of Investigation
CCTV China Central Television
BBC British Broadcasting Corporation
WW2
UFO unidentified flying object
UPI United Press International
MIT Massachusettes Institute of Technology
US United States
AD advertisement
NASA National Aeronautics and Space Administration

UNESCO
United Nations Educational, Scientific and Cultural Organization

WTO World Trade Organization
APEC Asia-Pacific Economic Cooperation
IMF the International Monetary Fu