单项选择题
Interference is anything that（）the communication of a message.
A.impact
B.imports
C.impedes
D.impair
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Whatever the speaker communicates is the message, which is sent（）a particular channel.
A.by all means
B.by no means
C.by any means
D.by means of -
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The speech communication process（）includes seven elements.
A.in the hole
B.at a whole
C.as a whole
D.to the whole -
单项选择题
Effective speakers adjust their voices（）the larger audience and work（）avoiding distracting physical mannerism and verbal habits.
A.at； to
B.in； at
C.to； at
D.to； for
