单项选择题

下列各组元音间区别性的描述，（)组是错误的。

A.[i]和[y]的区别是舌位前后不同
B.[u]和[o]的区别是舌位高低不同
C.[a]和ɑ的区别是舌位前后不同
D.[i]和[a]的区别是舌位高低不同

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