单项选择题

______ gave the famous speech I have a dream.

A．President Lincoln
B．Martin Luther King, Jr.
C．Douglass
D．Garrison
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单项选择题
Articulatory phonetics mainly studies ______.
A．the physical properties of the sounds produced in speech
B．the perception of sounds
C．the combination of sounds
D．the production of sounds
单项选择题
______ is the smallest unit of language in grammatical analysis.
A．Word
B．Morpheme
C．Allomorph
D．Root
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