单项选择题

A．Do research in the library.
B．Grade homework sets.
C．Teach an introductory economic course.
D．Make up homework problem.
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单项选择题
A．A flight.B．Cooking.C．Manners.D．A problem.
A．A flight.
B．Cooking.
C．Manners.
D．A problem.
单项选择题
A．Because the bird couldn’t repeat his master’s name.B．Because the bird screamed all day long.C．Because the bird uttered the wrong word.D．Because the bird failed to say the name of the town.
A．Because the bird couldn’t repeat his master’s name.
B．Because the bird screamed all day long.
C．Because the bird uttered the wrong word.
D．Because the bird failed to say the name of the town.
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