单项选择题

A．In a department store.
B．In a bank.
C．At a tourist bureau.
D．At a hotel.
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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 qualities that make the viewer feel that something unusual is happening
单项选择题
The word hierarchy (Line 12, Para. 1) refers to ______.
A．upper class
B．middle class
C．ranking system
D．community
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