单项选择题

A．Only one.
B．Two.
C．Three.
D．More than three.
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问答题
The author says that a natural concern of the Establishment is to _______________
单项选择题
Commercials create the sensation of loudness because ________.
A．TV stations always operate at the highest sound levels
B．their sound levels are kept around peak levels
C．their sound levels are kept in the middle frequency ranges
D．unlike regular programs their intensity of sound varies over a wide range
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