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Students wear masks during an activity to welcome the upcoming new year in Liaocheng, east China's Shandong Province, Dec. 31, 2010. [Xinhua photo]
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![Students wear masks during an activity to welcome the upcoming new year in Liaocheng, east China's Shandong Province, Dec. 31, 2010. [Xinhua photo]](http://images.china.cn/attachement/jpg/site1007/20110101/001372a9a93f0e8919d61f.jpg "Students wear masks during an activity to welcome the upcoming new year in Liaocheng, east China's Shandong Province, Dec. 31, 2010. [Xinhua photo]")
