单项选择题

Which of the following sounds is a voiceless bilabial stop

A．[p].
B．[m].
C．[b].
D．[t].
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Emerson based his religion on an intuitive belief in an ultimate unity, which he called ______.
A．the Spirit
B．the Overlord
C．the Oversoul
D．the Self
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A linguist regards the changes in language and language use as ______.
A．unnatural
B．something to be feared
C．natural
D．abnormal
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