单项选择题

A．the students
B．class preparation
C．class atmosphere
D．class interaction
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单项选择题
A．displacement of peopleB．transit stoppageC．serious injuriesD．airport delays
A．displacement of people
B．transit stoppage
C．serious injuries
D．airport delays
单项选择题
A．sociologyB．psychologyC．philosophyD．anthropology
A．sociology
B．psychology
C．philosophy
D．anthropology
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