People attend the memorial ceremony for victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province, Aug. 8, 2011. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua]

People present flowers at the monument for victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province, Aug. 8, 2011. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua]

People present flowers at the monument for victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province, Aug. 8, 2011. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua]

Photo taken on Aug. 8, 2011 shows incense being burned at the former residential area to commemorate victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua] 

A girl recalls her relative at the monument for victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province, Aug. 8, 2011. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua]

A woman of Tibetan ethnic group is seen at the memorial ceremony for victims of the landslide occurred a year ago in Zhouqu, northwest China's Gansu Province, Aug. 8, 2011. The mudslide devastation in the county on Aug. 8, 2010 left more than 1,700 people dead or missing and some 60,000 houses damaged.[Photo/Xinhua]