单项选择题

What can be inferred from the last paragraph

A．It's important that we develop a social network when young.
B．To stay healthy, one should have a proper social network.
C．Getting a divorce means risking a reduced life span.
D．We should share our social networks with each other.

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单项选择题

The way people shop ______

A．reflects the developmental stage of a country
B．carries social and cultural values
C．determines the way they socialize
D．reveals their social status

单项选择题

According to the last paragraph, the service quality of American service personnel may depend on ______

A．the customers' attitude towards them
B．their working experience
C．the length of their working hours
D．the amount of commission and tips