Some sports that were part of the Olympics in the past have been removed to __________ new sports which are more popular.
非洲草原上，当一群斑马遇到狮子攻击时，会头向内围成一圈，同时用后肢猛踢，斑马的这种行为属于（ ）
如图是一个正方体被截去一个正三棱锥得到的几何体，该几何体的俯视图为（ ）
苏伊士运河是亚洲与非洲的分界线，它的开通沟通了
