题目内容
In English, all the front vowels and the central vowels are ______ vowels.
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The sounds that begin and end the words church and judge are voiceless and voiced ______, respectively.
If two sounds are in complementary distribution, they are ______ of the same phoneme.
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The different phones which can represent a phoneme in different phonetic environments are called the ______ of that phoneme.
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