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The lips are covered with skin, its inner surface is lined with .
The lips are covered with skin, its inner surface is lined with .
正确答案：mucous membrane
标签：
动物解剖生理
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The mouth has the functions of ingestion, mastication, taste differentiation, and secretion of digestive juice.
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The pharynx is located in the back of the oral cavity and the cavity, above the larynx and the esophagus.