Many people are as to what to do when there is a fire.
A. at a loss
B. at risk
C. at ease
D. at a distance
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(答案→)A. at a loss
B. at risk
C. at ease
D. at a distance
解析：此处at a loss不知所措； at risk 冒着生命危险； at ease轻松地；at a distance遥远地；久远地；句意：许多人当有火灾的时候不知所措。根据句意选A。