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
We can get the information from the article that
A．tipping is very popular in European countries.
B．in Asian countries tipping never existed.
C．tipping is more popular in America than in Europe.
D．tipping is popular in America because the Americans are much richer.
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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