以奇峰、怪石、幽谷、秀水、溶洞“五绝”闻名于世,被誉为“立体的山水画”“扩大了的盆景”的是( )。[2014年辽宁真题]
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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