公共危机管理的首要目标，是在紧急情况下建立秩序，稳定公众，维持社会经济系统的正常运作。公共危机管理的主要原则包括（）。
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听力原文：W: You look tired Sam. Would you like a cup of coffee？
M: A cup of coffee. I think I need three or four.
What does the man mean？
A. He needs more than one cup of coffee.
B. He needs to sleep for three or four hours,
C. He wants to buy a set of coffee cups.
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