单项选择题

The little girl is just learning to walk and she's always______over.

A．tumbling
B．wagging
C．waving
D．swaying
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单项选择题
The______of such I. Q. tests full of questions on American culture was not questioned at that time.
A．significance
B．validity
C．efficiency
D．justification
单项选择题
The headquarters of this textile company is in New York while its 20______. companies are located in different parts of the world.
A．parent
B．subsidiary
C．inferior
D．ultimate
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