单项选择题

"This park has more than 200 waterfalls that are 15 feet or higher. And 150 of them have never been mapped or photographed," says park historian Lee Whittlesey. "Now that's a ______ to the size of Yellowstone."

A．proposition
B．hypothesis
C．ceremony
D．testimony
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单项选择题
Every year a number of students graduate from the school which will ______ new students the first week in September.
A．enroll
B．recruit
C．collect
D．reproduce
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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