单项选择题

A．A bus station.
B．An airport.
C．A super highway.
D．A train station.
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单项选择题
The passage is mainly about ______.
A．generation gap
B．establishment and authority
C．the young and their ambition
D．reward according to ability not according to age
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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