填出缩写
Unidentified Flying Object_____
Compact Disc_______
the United States of America______
参考答案:Unidentified Flying Object_____ UFO
Compact Disc_______ CD
the United States of America______USA
Unidentified Flying Object_____
Compact Disc_______
the United States of America______
参考答案:Unidentified Flying Object_____ UFO
Compact Disc_______ CD
the United States of America______USA