There are many signs in public places. You should know their meanings(意思). Or you will get into trouble(麻烦). For example, you will see the following(以下的) two signs on the wall in a hospital:

You may see the following two signs in a factory(工厂).

And you will see the following two on the street.

Signs are really important in our life. They are everywhere(到处都是).
Look at sigh B. it says_______.
A. You can smoke in the hospital.
B. You can't smoke in the hospital.
C. There is lots of smoke in the hospital.
D. There is no cigarette(香烟) in the hospital.
If you are hungry. which sign should you find on the street?
A. Sign A.     B. Sign F.         C. Sign C.         D. Sign E.
Which of the following is WRONG?

A．Signs are very important in our life.

B．If you see Sign C on a door, it means you can smoke in the room.

C．If you see Sign E in a place, it means you can park your car there.

D．We usually see Sign A in a toilet.