Classification of vowels is made up of the following EXCEPT（）。
- A、the openness of the mouth
- B、the position of the tongue
- C、the shape of the tip
- D、the width of the vowels
正确答案:D
答案解析:有
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小学教师资格
小学教师资格
Classification of vowels is made up of the following EXCEPT（）。
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