The world has about 3000 languages, which can be grouped into roughly 300 language families on the basis of similarities in their basic word stock and（）.
A.grammar B.construction C.pronunciation D.notion正确答案A
The world has about 3000 languages, which can be grouped into roughly 300 language families on the basis of similarities in their basic word stock and（）.
A.grammar B.construction C.pronunciation D.notion正确答案A
