单项选择题

Which is NOT the possible function of keeping pet

A．Lowering a person's blood pressure.
B．Preparing a young couple for the responsibilities of parenthood.
C．Encouraging social relationships.
D．Indicating the owner's social status and wealth.

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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

单项选择题

According to the passage we know tipping cannot be explained ______.

A．economically
B．culturally
C．psychologically
D．biologically