单项选择题

According to the passage, the maximum intensity of sound coming from commercials ______.

A．does not exceed that of programs
B．is greater than that of programs
C．varies over a large range than that of programs,
D．is less that that of programs
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单项选择题
According to the author, the following are the function of a junior and community college except ______.
A．it can help you become better equipped to continue education
B．it can help you to learn to face the challenges in life
C．you will learn how to think and learn
D．you will have decision-making classes
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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