单项选择题

All of the children studied

A．attended the same school.
B．were in the same socioeconomic class.
C．were the same age.
D．knew each other.
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单项选择题
What can we know about the origin of tip
A．It originated from the English inn service.
B．The original purpose of tip was to ensure that waiter could get more money.
C．The waiter threatened the customers with bad service if no tips were given.
D．It originated in a small English village.
单项选择题
The author thinks that
A．tipping can benefit greatly a country's economic growth.
B．tipping can ensure the quality of service a customer receives.
C．tipping can improve a country's cultural environment.
D．tipping is not conductive tertiary industry.
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