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Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?蒲俊和苏岸站在阵后，相视笑道：没想到这样简单，根本就不用费神。Public void method2 () {}Why can't the poor get rid of poverty? Many experts and scholars are studying this problem, but they have not given a convincing answer. Until ten years ago, American economist Mullenathan found psychologist Shafir: "Let's study this problem together!"According to Mei Xiangrong, the "Charming Card" program is mainly embodied in three aspects. The first is the Brand City Plan, "Charming China City" and the City Alliance have opened up the brand promotion of the city. CCTV has provided a "media + industry" urban development platform, while "Charming Card" has inserted the wings of the Internet into the development of the cultural and tourism industry. The second is the brand scenic spot plan. We hope to directly connect the scenic spots of the city brand with the "Charm Card" on the basis of the platform of "Charm Card". The third is the brand establishment plan of Charming China City. In the future, we can rely on the "Charming Card" to let the city's characteristic agricultural products really come to the city and go to the dining table.放暑假了，来自科幻世界的仙霞姐姐为爱好科技的孩子们创办了一个“AA 欢乐营”，让孩子们在那里度过了一个有趣、欢乐的假期。在AA欢乐营中，孩子们懂得了互相学习、团结友爱、自强自立、认真负责等道理，在那里，他们遇到了一个又一个与自然界息息相关的问题：如恒温动物和变温动物的区别；数学中勾股定律的历史、概念；化学中水是由什么物质组成的；物理中光点的产生和原理等等。围绕这些自然界的课题，孩子们都展开了激烈的辩论。暑假很快就要结束了，仙霞姐姐为孩子们设计了一次考试，孩子们通过自己的智慧和勇气，解开了一道道难题，结束了考试，取得了优秀的成绩。仙霞姐姐希望孩子们今后继续努力学习，用自身学到的知识来为祖国现代化科学做出贡献。