单项选择题

The main difference between/m/，/n/，and/η/lies in（）.

A.manner of articulation
B.sound duration
C.place of articulation
D.voicing

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单项选择题
The sound of ch in teacher is（）.

A.voiceless，post-alveolar，and affricative
B.voiceless，dental，and fricative
C.voiced，dental，and fricative
D.voiced，post-alveolar，and plosive
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