The surviving languages fall into eight principal groups. Balto-Slavic, In-do-Iranian, Armenian and Albanian belong to the ______ set.

单项选择题The Indo-European language family is made up of most of the languages of Europe, the Near East, and ______.

单项选择题It is assumed that the world has approximately 3000 (some put it 5000) languages, which can be grouped into roughly ______ language families on the basis of similarities in their basic word stock and grammar.