单选题
Classification of vowels is made up of the following EXCEPT（ ）
A、
the position of the tongue
B、
the openness of the mouth
C、
the shape of the lip
D、
the width of the vowels
【正确答案】
D
【答案解析】
英语元音有四种分类：the position of the tongue in tile mouth；the openness of the mouth；the shape f the lip；the length of the vowels。
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