题目内容
Since /p/ and /b/ are phonetically similar, they occur in the same environments and can distinguish meaning, they are said to be ______.
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A(n) ____ is a unit that is of distinctive value. It is abstract unit, a collection of distinctive phonetic features.
_______ is the smallest meaningful unit of language.
Words can be classified into open class words and _____ class words.
A morpheme which can be a word by itself is called a ______ morpheme, whereas a morpheme that must be attached to another one is a ______ morpheme.
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