Medical staff members attend a quake rescue drill in Yinchuan, capital of Ningxia Hui Autonomous Region, northwest China, May 12, 2009, China's first National Disaster Prevention and Reductin Day on the occasion of the first anniversary of the May 12, 2008 Wenchuan earthquake.(Xinhua Photo)

Firefighters attend a quake rescue drill in Yinchuan, capital of Ningxia Hui Autonomous Region, northwest China, May 12, 2009, China's first National Disaster Prevention and Reductin Day on the occasion of the first anniversary of the May 12, 2008 Wenchuan earthquake.(Xinhua Photo)

Students take part in a quake rescue drill at Jingcheng Experimental School in Hangzhou, capital of Zhejiang Province in east China, May 12, 2009, China's first National Disaster Prevention and Reductin Day on the occasion of the first anniversary of the May 12, 2008 Wenchuan earthquake.(Xinhua Photo)

Students take part in a quake rescue drill at Jingcheng Experimental School in Hangzhou, capital of Zhejiang Province in east China, May 12, 2009, China's first National Disaster Prevention and Reductin Day on the occasion of the first anniversary of the May 12, 2008 Wenchuan earthquake. (Xinhua Photo)

Students take part in a quake rescue drill at Jingcheng Experimental School in Hangzhou, capital of Zhejiang Province in east China, May 12, 2009, China's first National Disaster Prevention and Reductin Day on the occasion of the first anniversary of the May 12, 2008 Wenchuan earthquake.(Xinhua Photo)