题目内容：

Today’s post is almost about signs in English, you will see signs on the road while driving or when walking down a street. Now let’s take a closer look at the signs in the picture below, so you can fully understand what they mean in case you come across one of them.

Starting with the top row, we have a:

yield sign — This sign indicates (标示) that you need to slow down, but you may not have to come to a full stop.

Crosswalk — This is a sign that indicates people have the right of way to cross the street, so cars have to stop when they see a person waiting next to one of these signs.

Second row:

do not enter — This sign indicates you are not allowed to enter a road at that point.

Buckle up! — There are often signs on roads in the United States reminding people that wearing seat belts (安全带) is mandatory (强制的) (seat belts laws differ depending on what state you are in, but all US states have seatbelt laws).

Third row:

be alert (警惕的) for bears — This is another sign that is used to indicate to drivers and pedestrians (行人) that they should be alert for wildlife in the area.

Playground — This is the sign used to alert drivers that there is a playground nearby, so it is a good idea to slow down and watch for children.

1.Where can you often see the signs?

A．In a factory

B．On a farm

C．On the road

D．In the class.

2.What would you do when you see yield sign?

A．Slow down.

B．Enter a road at that point.

C．Have to come to a full stop

D．Should be alert for wildlife in the area.

3.What can be learned from the passage?

A．US states have the same law about seat belts

B．All the people in a car should buckle up in US

C．Pedestrians should walk slowly at a crosswalk

D．Drivers should stop the car at the sign of playground

4.What does the underlined phrase “watch for” in the last line mean?

A．See

B．Look at.

C．Look for

D．Pay attention to