题目内容

__1__means under the lower jaw.

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__1__means pertaining to the face.

__1__means pertaining to surrounding the anus.

__1__means surgical repair of the roof of the mouth.

使声音得到扩大和美化的是( )

A. 呼吸器官
B. 口腔器官
C. 声源器官
D. 共鸣器官

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