单项选择题

Which of the following is a central vowel

A．[e]
B．[i]
C．[u]
D．

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The minimal unit of meaning is the ______.
A．morpheme
B．phoneme
C．syllable
D．word
单项选择题
In 1974, ______ resigned as a consequence of the Watergate Scandal.
A．Kennedy
B．Nixon
C．Truman
D．Roosevelt
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