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Volunteers take part in the activity held by Mexico's Health Department to mark the World AIDS Day in Mexico City Dec. 1, 2008. [Xinhua]
![Volunteers take part in the activity held by Mexico's Health Department to mark the World AIDS Day in Mexico City Dec. 1, 2008. [Xinhua]](http://images.china.cn/attachement/jpg/site1007/20081202/000bcdb95f1d0a9f39ef5b.jpg "Volunteers take part in the activity held by Mexico's Health Department to mark the World AIDS Day in Mexico City Dec. 1, 2008. [Xinhua]")