单项选择题

Absorbed in her work, she was totally ______ her surroundings.

A．liable for
B．separated by
C．oblivious of
D．concerned about
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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
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
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