根据材料内容，选择正确答案。

    School trips are one of the things that school children hope for about school. They are one way to show children that they can also learn much outside the classroom.

A good side of having a school trip is that children can use the learned or the learning things in class in true life. Knowledge in science and maths can be used. Then students will remember their lessons well. Also, students will have first-hand information on how their school subjects work outside classroom. For example, a visit to a museum can not only learn about history but can also learn about science or geography.

    What's more, always learning in classroom may make some kids lose interest in a subject. This is really true for some difficult subjects. However, kids can learn in new environments during school trips and take on as much information as they want and can.

    School trips also help kids get to know each other in a more relaxed environment, without thinking about tests or grades.

    Showing students the larger world around them can really help them learn more.

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我国古代的专制主义中央集权制度在二千多年的发展过程中，经历了一个形成、发展、巩固、强化的过程。阅读下列材料并结合所学知识，回答问题：
材料一

材料二：武帝施主父（即主父偃）之策，下推恩之令，使诸侯王得分户邑，以封子弟。
                                                    ——摘自《汉书·诸侯王表》
材料三：明朝建立之后，朱元璋为了解决君相之争，于1380年，将丞相胡惟庸诛杀，在随后的十年里，大肆捕杀其党羽，株连杀戮3万余人，并对我国政治制度进行了重大改组。
材料四：清朝沿用明朝政治制度，内阁任然是政府的中枢机构。但因受清朝建立并保留下来的议政王大臣会议的制约，权力有限，使皇帝集权受到较大影响......后来，清朝统治者对中央中枢机构进行了改组。