本期难句分析：
1.Everyone should know where the nearest fire alarm box is located and where exits, fire escapes, and fire doors are.
结构：本句有三个谓语动词，其中主句的谓语动词为should know，其余两个都是由where引导的并列宾语从句。本句可以拆分为：
1) Everyone should know.
2) Where the nearest fire alarm box
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