单项选择题

A．Make up homework problems.
B．Do research in the library.
C．Teach an introductory economies course.
D．Grade homework sets.
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单项选择题
A．Take a break from studying.B．Go out to get something to eat.C．Do something to cool off.D．End their hike.
A．Take a break from studying.
B．Go out to get something to eat.
C．Do something to cool off.
D．End their hike.
填空题
organization
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