Sociology is the study of language in relation to（）,such as social class, educational level and so on.

（）is the study of second and foreign language teaching ...

填空题（）is the study of second and foreign language teaching and learning.

Psycholinguistics is the study of the mental processes ...

填空题Psycholinguistics is the study of the mental processes that a person uses in producing and understanding language, and how humans learn （）.

Linguistics is the study of language as a system of hum...

填空题Linguistics is the study of language as a system of human （）.