Tourists line for visiting the Potala Palace in Lhasa, southwest China's Tibet Autonomous Region, April 21, 2009.[Purbu Zhaxi/Xinhua]
![Tourists line for visiting the Potala Palace in Lhasa, southwest China's Tibet Autonomous Region, April 21, 2009.[Purbu Zhaxi/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20090422/000bcdb95f1d0b58af6409.jpg "Tourists line for visiting the Potala Palace in Lhasa, southwest China's Tibet Autonomous Region, April 21, 2009.[Purbu Zhaxi/Xinhua]")