Exercise books of a student is wet and muddy during a heavy rainstorm in Fangshan District, Beijing, July 22, 2012. Precipitation was heaviest in the suburban district of Fangshan, with levels hitting 460 mm, according to the report. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/QQ]