Students of Yanxing Primary School pose for a group photo during a visit to a botanical garden in Harbin, capital of northeast China's Heilongjiang Province, May 30, 2012. Some 5,000 students of over 10 primary schools of Harbin visited the Heilongjiang Forest Botanical Garden on Wednesday. Children across China joined in various activities in recent days to celebrate the upcoming International Children's Day, which falls on June 1. [Xinhua]