13. 一儿童说:“每颗星星上都有一个人拿着手电筒对着我们一会儿开一会儿关,所以星星就会眨眼睛了。”这反映了学前儿童学科学具有( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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