单选题 Children are often________sports at an early age.As they get older and start school, they participate in sports as a way to make friends and be active.
【正确答案】 B
【答案解析】选项A为“参加，加入”；选项B为“接触；体验”；选项C为“沉湎于，沉迷" ；选项D为“和…相关，涉及”。根据句意，孩子们是很小就接触到运动，故选B。