单项选择题

A．Make up homework problems.
B．Do research in the library.
C．Teach an introductory economics course,
D．Grade homework sets.
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单项选择题
A．New York City.B．Harlem.C．Silver, South Carolina.D．California.
A．New York City.
B．Harlem.
C．Silver, South Carolina.
D．California.
单项选择题
A．Population.B．Wars.C．Nuclear explosions.D．Violence in crime.
A．Population.
B．Wars.
C．Nuclear explosions.
D．Violence in crime.
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