A ____ is a variety of language that serves as a medium of commu

A ____ is a variety of language that serves as a medium of communication among groups of  people for diverse linguistic backgrounds .
A、lingua franca
B、register
C、Creole
D、national language
【正确答案】：A
【题目解析】：A. lingua franca：这是一个专有名词，指的是一种通用语言或混合语言，被来自不同语言背景的人们用作交流的工具。它通常不是任何一方的母语，但能被广泛理解和使用，符合题目描述的语言变体作为交流媒介的角色。