单项选择题

A．necessary
B．good
C．helpful
D．useful
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填空题
Visitor’s plans: ________.
单项选择题
Which of the following is not mentioned in the passage
A．American people learn to be independent from childhood.
B．American people tend to think independently.
C．All the American young people have to move away from their families before 19.
D．American society wants its young people to live independently.
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