单选题
The residents were asked to leave because ______.
A、
the firefighters were unfair
B、
the fire was moving fast making it dangerous
C、
the firefighters were overly careful
D、
it was easier for the firefighters
【正确答案】
B
【答案解析】
第一、第二段。火势蔓延迅速，为安全起见，居民被撤离。
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