Countries around the globe should ( ) the principle of common but differentiated responsibilities" and work together to meet the global climate challenge.

　　A.linger

　　B.persist

　　C.stick

　　D.uphold

　　【答案】C。考查动词辨析。A 项：消磨、磨蹭;B 项：固执不改(更强调贬义);C 项：主要是坚持观点、看法、原则等;D 项：支撑、赞成。根据句意：各国应坚持共同但有区别的责任原则，携手应对全球气候变化挑战。C 项符合语境，故正确答案是选项 C。