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Fri, 14:46 29 Feb 2008 GMT17

 
The AlertNet Challenge
1 of 6

QUESTION 1
According to the United Nations, for the first time in history half of the world's population will be living in cities by...
The end of 2008
The middle of the century
The end of the century


URL: http://www.alertnet.org/quiz/120429576952.htm

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