In a diglossic country, the two diglossic forms of language are generally two varieties of the same language, but there are situations in which the H-variety may have no ______ relationship with the L-variety.

单项选择题The goal of ______ is to explore the nature of language variation and language use among a variety of speech communities and in different social situations.

单项选择题The differences between standard and non-standard, are different language varieties in a ______ situation, and are parallel but not identical.