The differences between standard and non-standard are different

The differences between standard and non-standard are different language varieties in a ______ situation, and are parallel but not identical. ()
A、diglossic
B、bilingual
C、linguistic
D、sociolinguistic
【正确答案】：D
【题目解析】：(P170)解析:标准语与非标准语的区别,一方面它们在社会语言环境中是不同的语言变体,另一方面,它们既很相似又不是完全相同。