In ancient China, people used to send smoke _____ to warn that the enemy were coming.
In ancient China, people used to send smoke _____ to warn that the enemy were coming.
A、signs
B、signals
C、symbols
D、marks
【正确答案】：B
【题目解析】：这个题考四个名词的比较, 其中: signs 迹象; signals 信号; symbols 象征; marks 分数.
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