The fact that different languages have different words for the same object is good proof that human language is （）.

In terms of the place of articulation, the following sounds [t][d][s][z][n] share the feature of （）.

A.palatal
B.alveolar
C.bilabial
D.dental

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What the element ‘-es’ indicates is third person singular, present tense, the element ‘-ed’ past tense, and ‘-ing’ progressive aspect. Since they are the smallest unit of language and meaningful, they are also（）.

A.phonemes
B.morphemes
C.allophones
D.phones

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