以下有关元素性质的说法不正确的是（   ）

材料一：自强运动是晚清政府在内忧外患交困的危急形势下的一个自救运动。由于在对内对外战争中对西方的坚船利炮的威力大开眼界，对来自西洋的“数千年来未有之强敌”（李鸿章语）开始有所认识，这样才能转而主张缓和与西方的紧张关系，并引进西方军事技术，以求“御侮自强”之术。                            ——罗荣渠《现代化新论》
材料二革命成功后，上海的报纸不无戏谑地罗列了革命前后的变化：“共和政体成，专制政体灭；中华民国成，清朝灭；总统成，皇帝灭；新内阁成，旧内阁灭”。
——张鸣《辛亥：摇晃的中国》
材料三 胡适说，北大是因为三个兔子而成名的，一是老兔子蔡元培；二是中兔子陈独秀，三是小兔子胡适本人（三人年有长幼，但都属兔）。
——洪向华主编《复兴之路》
请回答：
（1）材料一提到的“自强运动”指什么历史事件？清政府寻求“御侮自强”之术的口号是什么？
（2）材料二中的“革命”是指哪一重大事件？“革命成功“的历史意义是什么？
（3）材料三中的“三个兔子”在北大因高举哪两面大旗而闻名？为此掀起了哪一场思想解放运动？
（4）以上三则材料都体现了中国近代社会的一个重要发展历程，请你为此历程做一个主题归纳。

    Why does the Leaning Tower of Pisa in Italy lean? It leans because of a mistake. It has leaned almost since the day the builders b____ it.
In 1774, the people of Pisa in Italy wanted to build a bell tower. They wanted the tower to be the m____beautiful bell tower in Italy. The city needed a bell tower because the church(教堂) did not have o____ . As soon as the first floor of the building was finished, the tower started to lean. Builders t____  to make the building straight again as they added more floors, but the leaning tower got w____ as the tower grew. It took about 180 years to finish the tower. Today, the leaning tower has eight f____  It is 54.5 meters t____. And it leans almost 4 meters to one s____ . The tower is also sinking(下沉) into the g ____ on which it was built. Every year, the tower leans a____ 1.7 cm.