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。