text: Police verified that on the morning of May 13, the boys and girls of 3B class played and bit each other's hands?
classes:  No, because the teacher didn't settle the case, the parents went to school to protect their children's rights.  Also, because the teacher didn't settle the case, the parents went to school to protect their children's rights.  Yes, because the teacher didn't settle the case, the parents went to school to protect their children's rights.