单项选择题

Tipping in America now is regarded as all the following EXCEPT ______.

A．the index of one's status in a sense
B．part of the accepted cost of a service
C．a reflection of their character
D．a kind of personal attitude
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单项选择题
According to the passage we know tipping cannot be explained ______.
A．economically
B．culturally
C．psychologically
D．biologically
单项选择题
What is the original meaning of the tip
A．It is to reward the efforts of good service.
B．It is a promise of on-time service.
C．It is used to reduce uncomfortable feelings of inequality.
D．It serves no useful function.
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