某草场有480只兔子,其中白兔、黑兔、灰兔和棕兔分别有160、128、100和92只。问至少要放出多少只兔子,才能保证放出的兔子中一定有100只颜色相同?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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