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【单选题】
下列有关语音单位的说法正确的一项是:( )A.
音节是最小的语音单位，它最容易被自然感知。
B.
发辅音时不振动声带，因此辅音气流较弱。
C.
音节是声母、韵母、声调构成的超音段成分。
D.
韵母位于音节的后段，由元音或元音加辅音构成。
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