In public places we can often see that tell us useful things such as no parking no smo

问题补充：

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

答案：

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。

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