1.“感到精神疲乏,心里烦躁,无法集中注意力,学习效率降低,进度减慢甚至停滞”, 具有上述症状和表现的学习卫生问题被称为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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