In public places, we can often see that tell us useful things, such as no parking, no smoking, etc.
A. symptoms
B. signs
C. systems
D. signals
网友回答
A. symptoms
(答案→)B. signs
C. systems
D. signals
解析：名词辨析。A症状；B迹象，征兆，符号；C系统；D信号；句意：在公共场所，我们经常能看见一些符号，这些符号告诉我们一些有用的信息如不准停车，不准抽烟等。