单项选择题
Of the three branches of phonetics, the longest established, and until recently the most highly developed, is（）phonetics.
A.auditory B.acoustic C.articulatory D.none of the above three
单项选择题 In English, “pill” and “bill” are （）.
单项选择题 As modern linguistics aims to describe and analyze the language people actually use, and not to lay down rules for "correct" linguistic behavior,it is said to be （）.
名词解释 Duality
