Basic General Knowledge
World's busiest airports by passenger traffic is

Lhasa Airport, Tibet
Chicago O' Hare International Airport, USA
Hartsfield-Jackson Atlanta International Airport, USA
King Abdul Aziz International Airport, Saudi Arabia

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Basic General Knowledge
The official languages of the United Nations are

Chinese, English, French, Hindi, Japanese and Spanish
African, Chinese, English, French, German and Spanish
Arabic, Chinese, English, French, Russian and Spanish
Arabic, Japanese, Chinese, English, French and German

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