单项选择题

A．To observe people’s attitude towards strangers.
B．To see how people get along with their friends.
C．To change people’s behavior in social life.
D．To find out how shy people are.
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单项选择题
A．To play the violin once again.B．To go to the United States.C．To apply for a scholarship.D．To have her performance taped.
A．To play the violin once again.
B．To go to the United States.
C．To apply for a scholarship.
D．To have her performance taped.
单项选择题
A．By prediction.B．By recording.C．By observation.D．By examination.
A．By prediction.
B．By recording.
C．By observation.
D．By examination.
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