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.
单项选择题
A．Because their parents die.B．Because the number of divorces has gone up.C．Because people live longer than before.D．Because them are so many unmarried couples.
A．Because their parents die.
B．Because the number of divorces has gone up.
C．Because people live longer than before.
D．Because them are so many unmarried couples.
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