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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单项选择题

Compared with four-year colleges, community colleges ______.

A．are more attractive to the high-school graduates
B．provide more opportunity to work with local business to identify specific needs
C．are of more importance in boosting economy
D．prepare you to become a manager

单项选择题

One of the reasons why commercials are able to at, act viewer attention is that ______.

A．the human voices in commercials have more auditory impact
B．people like cheerful songs that change dramatically in sound quality
C．high-frequency sounds are used to mask sounds that drown out the primary message
D．they possess sound qualities that make the viewer feel that something unusual is happening