题目

At least 36 people have been killed and another 42 people have been injured in a stampede that broke out during a New Year Eve celebration in downtown Shanghai, which may have been caused by the crowd rushing to grab fake money thrown from the balcony of a building. Survivors described the stampede as horrible and hellish. A woman said she covered two kids in front of her with her arms in the chaos. Her son followed her. Dirty shoe prints covered her son's clothes when the 12-year-old boy came to safety. The crowd was in a panic. We stood in the crowd, feeling squeezed and almost out of下列物质分别放入一密闭的充满氧气的集气瓶里，充分燃烧后，冷却至室温，由于瓶内压强的明显减小，使瓶塞难以启开的是A．木炭 B．红磷 C．蜡烛 D．硫