Were you the first or the last child in your family? Or were you a middle or an only child? Some people think it matters where you were born in your family. But there ____(be)different ideas about____birth order means. Some people say that the oldest children,____are smart and strong-willed, are very likely to succeed. The reason for this is simple. Parents have a lot of time for their first child and give him or her a lot of attention. An only child will succeed for____same reason.

    What happens to the other children in the family? Middle children don't get so much attention, so they don't feel that important. If a family has many children, the middle one sometimes gets____(lose)in the crowd. The youngest child,____ often gets special treatment. Often this child grows up to be funny. But a recent study saw things quite  ____(different). The study ____(find) that first children believed in family rules. They didn't take many chances in ____(they)lives. They usually followed orders. Rules didn't mean as much to later children in the family. They took chances and they often ____(do) better in life.

地方行政制度是古代中国政治文明的重要组成部分。阅读下列材料：

材料 （秦）郡县官吏统统由享受俸禄的职业官僚担任，任免权集中于中央。……郡守掌行政，郡尉掌军事，郡监御史掌监察。……郡县官必须服从朝廷的统一调动。官员调任官职，不得携带旧部属吏。每年正月“大课”，中央考课郡守，郡守考课县令长。 ——李治安主编《唐宋元明清中央与地方关系研究》

请回答：

据材料，概括秦朝郡县制度的主要内容。