The phenomenon that two languages are used side by side with each having a different role to play is known as

A.diglossia.
B．creole.
C．pidgin.
D．bilingualism.


【参考答案】

A
同一语言社区中，两种语言同时并存，每种都有其不同的社会地位和作用的现象叫双语现象(diglossia)。