To put it in a simple way， linguistics studies（）， meaning of linguistic units， and the use and interpretation of a sentence in different contexts.

To put it in a simple way， linguistics studies（）， meaning of linguistic units， and the use and interpretation of a sentence in different contexts.
A.properties of speech sounds
B.combination of speech sounds into a meaningful unit
C.word formation
D.sentence structure
正确答案：properties of speech sounds；combination of speech sounds into a meaningful unit；word formation；sentence structure