Some 13,000 people take part in an earthquake drill in Chongzhou, Southwest China's Sichuan province, Nov 22, 2011. The drill was based on a mock 6.4-magnitude earthquake shaking several towns in Chongzhou city and Dujiangyan city. It included emergency evacuation, self rescue, disaster prediction, medical aid, epidemic prevention and relocation. [Photo/CFP]

Medical workers load a mannequin on to a stretcher during a quake drill in Chongzhou, Nov 22, 2011. [Photo/CFP]