A visitor looks at a pricture at an exhibition marking the 50th anniversary of the Democratic Reform in Tibet Autonomous Region in Beijing, Feb. 25, 2009. The exhibition opened on Feb. 24 and runs until April 10.  (Xinhuanet Photo)

Visitors watch a documentary showing the past and present of Tibet at an exhibition marking the 50th anniversary of the Democratic Reform in Tibet Autonomous Region in Beijing, Feb. 25, 2009. (Xinhuanet Photo)