《墨子·告子》载:“诸侯朝天子曰述职。一不朝,则贬其爵;再不朝,则削其地;三不朝,则六师移之。”这段材料反映的历史现象是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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