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
That evening roving gangs of white teenagers began to attack blacks in downtown Chicago, and the city erupted in a five-day race ______ that ended with 38 deaths, 537 serious injuries, and widespread destruction.
A．fuss
B．maneuver
C．deterioration
D．riot
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
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