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The lower photo shows commuters board metro without lining up at Beijing Fuxingmen metro station Beijing on Sunday, March 11, 2007. The upper one shows a line of passageners is queuing to get on with the guide of volunteers at Wangfujing metro station Beijing yesterday.The same day was declared the second official "Queue Day" in Beijing to remind residents of the benefits of lining up for things. Experts say the days should be introduced in other cities to provide people with a better understanding of social etiquette. [Xinhua]