Languages in the world can be classified into families, such as the Indo-European family the Sino-Tibetan family, the Afroasiatic family, the Austronesian family, the Austro-Tai Family, and the Altaic family. Among them, ______ is the first and most widely investigated language family of the world. ()
A、Sino-Tibetan
B、Afroasiatic
C、Austronesian
D、Indo-European
【正确答案】：D
【题目解析】：(P151)解析:在大约30个语系中,印欧语系(简称Indo--European)是世界上建立起来的第一个、也是调查最广泛的语系。
