（）can be differentiated by a number of factors: the position of tongue in the mouth, the openness of

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（）can be differentiated by a number of factors: the position of tongue in the mouth, the openness of the mouth, the shape of the lips, and the length of the vowels.

A.Vowel sounds

B.Consonant sounds

C.Voicing sounds

D.Devoicing sounds

参考答案:

答案：Vowel sounds

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