Photo taken on May 27, 2008 shows the makeshift classrooms of the Ningqiang No.1 Middle School in Ningqiang County northwest China's Shaanxi Province. A 5.7-magnitude aftershock hits the county on Tuesday.

Students of the Ningqiang No.1 Middle School study outside the tents in Ningqiang County northwest China's Shaanxi Province, May 27, 2008. A 5.7-magnitude aftershock hits the county on Tuesday.