单项选择题

A．common
B．useful
C．important
D．difficult
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单项选择题
In a big university, what may several thousand students be taking at the same time
A．Arts and sciences.
B．Geometry.
C．A compulsory course.
D．A course in poultry marketing.
单项选择题
Who inspired Ruth Handler to design the Barbie doll
A．Technicians and engineers at Mattel.
B．Charlotte Johnson.
C．Lilli.
D．Harold Mattson.
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