College entrance exam paper marking staff work at a paper marking room for the politics subject in the Northwest Normal University in Lanzhou, capital of northwest China's Gansu Province, June 13, 2013. In total 2,150 paper marking staff members need to mark the exam papers of 283,424 participants of 2013 college entrance exam in Gansu from June 10 to June 22. (Xinhua/Fan Peikun)