Parents wait outside a school as their children go through the national college entrance exam, in Taiyuan, North 皇冠体育app's Shanxi province, on Monday June 7, 2010. [Photo/Xinhua]

A taxi driver sticks a tag on his windshield, offering free trips for college entrance exam-taking students, in Changsha, Central 皇冠体育app's Hunan province, on Sunday, June 6, 2010. [Photo/Xinhua]

Parents wait outside a school as their children go through the national college entrance exam, in Yinchuan, Ningxia Hui autonomous region, on Monday June 7, 2010. [Photo/Xinhua]