7.The roads in cities are usually very busy.There are lots of cars,buses,taxis,and bikes on the road.We need to be careful.Now took at the signs and learn the traffic rules:
Traffic lights have three colors.A red light means "Stop".We must not cross the road.A green light means "Go".We can walk across the street quickly.A yellow light means "Wait".
This sign means "You must not ride bikes here".
This sign means "You must not turn left".
What does this sign mean?It means "Be careful".
Be careful.People are working on the road.
Be careful.There is a school nearby.
Do not drive faster than 30km an hour.
回答問題
(1)What does this sign mean
?
(2)How many colors do the traffic lights have
?
(3)What does a red light mean
?
(4)Are there lots of cars,buses,taxis and bikes on the road in cities
?
(5)Do we need to be careful on the road
?