题目内容：

将横线中的填空
What ' re those They have 3 eyes ,red ,yellow and green.
oh,they are-------.
But why do they have 3 colours?
Because there are ---- ---.Look!it's a red light.Let's ------!
oh,I see.Stop at a red light.It's yellow.Can we go?
No,-----at a yellow light.It's green now.Let's ----.
So these are the---- -----.I remember now.

优质解答

traffic lights traffic singals stop ready go functions