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 than that of programs

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单项选择题

One of the reasons why commercials are able to attract 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 qualifies that make the viewer feel that something unusual is happening