在比例尺为1:1000000的地图上量得甲、乙两地的距离为15厘米,甲、丙两地的距离为12厘米,乙、丙两地的距离为9厘米,并量得丁地与甲、乙两地的距离都为7.5厘米,问丙、丁两地的实际距离为多少公里?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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