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

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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Of the three branches of phonetics, the longest established, and until recently the most highly developed, is（）phonetics.

A.auditory
B.acoustic
C.articulatory
D.none of the above three

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