多选题Of all the speech organs, the _______ is/are the most flexible. （ ）多选题A(n) ___________ is a unit that is of distinctive value. It is an abstract unit, a collection of distinctive phonetic features. ( )多选题The rules governing the phonological patterning are language specific.多选题Any sound produced by a human being is a phoneme. （ ）多选题________ is a voiced alveolar stop. ( )多选题When two different forms are identical in every way except for one sound segment which occurs in the same place in the strings, the two words are said to form a phonemic contrast. （ ）多选题Not all the back vowels are rounded vowels. （ ）多选题Since /p/ and /b/ are phonetically similar, occur in the same environments and they can distinguish meaning, they are said to be ___________. ( )多选题The sounds produced without the vocal cords vibrating are ____ sounds. ( )多选题According to the manner of articulation, some of the types into which the consonants can be classified are stops, fricatives, bilabial and alveolar. （ ）