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 |
相关知识点
推荐套卷
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 |