南极考察队员可能遇到的危险有( ) ①暴风雨迎面扑来,看不清路 ②积雪覆盖冰隙,随时都有可能吞没人员 ③酷冷的严寒,给队员留下无情的冻伤 ④整个南极洲上很难碰到人,难以求援 ⑤随时可能遭受到熊的袭击
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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