单项选择题

While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.

A．authorize
B．license
C．counteract
D．endorse
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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
When I found the light switch, the unshaded bulb only illuminated two small cats, sitting on the table ______ round the inside of the empty ham tin.
A．swallowing
B．gorging
C．licking
D．digesting
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