【单选题】Look at the picture. Can you see some boys ______ basketball? [ ]
【单选题】There ______ some boys on the playground.
【单选题】The missing boys were last seen ______ near the river. [ ]
【判断题】列车事故应急处置原则:处置列车事故遵循“先通后复”的原则。
【多选题】公交集团公司火灾事故处置方案》制定的处置原则为()地处理公交集团公司发生的火灾事故。