单项选择题

While researchers may not______the expansive claims of hard-core vitamin en thusiasts, 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
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