Mimi,Micky and their classmastes are going on a socila studies field trip.They come to a hospital.The rabbit puts her sign in front of the hospital.She wangs to tell people,"Be quiet."They come to a busy street.The dog holds up his sign to tell people,"No crossing!"Mimi holds up a sign to tell people,"Look out!"They come to a beautiful park.The panda holds up his sign to tell people,"Keep off the grass."Micky points to his sign to tell people,"No littering."Micky feels hungry.He eats a banana.then he throws the banana skin on the ground.What is wrong with Micky?What are his classmates doing now?