题目内容
In English, a phoneme may be represented by two or more allophones. The choice of the allophone is ______.
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For linguists, the study of s______ is of greater importance than that of writing.
If similar sounds that occur in the same environments are two distinctive phonemes, they are said to form ______.
______ are produced by moving from one vowel position to another through intervening positions.
Of the three branches of phonetics, the longest established, and until recently the most highly developed, is ______.
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