（）is the study of speech sounds in language or a language with reference to their distribution and patterning and to tacit rules governing pronunciation.

A. speech sounds (voice)
B. meaning in a language
C. the structure of phrases
D. how sounds are used to convey meaning

A.the future of global free trade is optimistic.
B.developing countries make no contribution to liberalization.
C.the concern of developing countries may affect the progress of liberalization.
D.issues negotiated in the Doha round of global trade talks weren’t practical.