一个有理数的平方是正数，那么这个数的立方是（   ）

在所有制结构中，民营企业占浙江省总量达90%，而且民营企业贡献了60%的税收，70%的GDP，80%的出口，90%的就业，要推动民营企业进一步发展，就需破除制约其发展的“玻璃门”与“弹簧门”。为此，要确立凡是法律法规未明确禁入的行业、领域都应该鼓励民间资本进入，凡是我国政府已向外资开放或承诺开放的领域都应该向国内民间资本开放。

结合材料，运用“多种所有制经济共同发展”的知识，说明确立“二个凡是”的依据与意义。

    While ____ (visit) Hangzhou's West Lake and its surrounding beautiful hills, you'll understand ____ it's been a great source of inspiration（灵感）for artists,poets and philosophers throughout Chinese history.

    Though ____ rest of the country is moving from two wheels to four,cycling culture is thriving（繁荣的）in Hangzhou. The city ____ (develop) China's first bike-sharing system in 2008.Since then,it's grown into the world's ____ (big) and one of the world's best public bike systems.

    Hangzhou grows some of China's finest green tea—Longjing.Every spring,before the traditional Qingming Festival, tea ____ (love) from all over the country come to Longjing, a village ____ lies just south of West Lake,for the first cut of top-quality tea. During tea season— ____ (usual) late March and April—the air is filled with smell from the tea, when leaves ____ (pick) and roasted in the village.The village is open to the public and you can pick your own tea after getting ____ (permit) from the local tea farmers.

论从史出是学习历史的一个重要特点。“清政府完全成为帝国主义统治中国的工具”的依据是什么（　　）

发生于19世纪60年代的日本明治维新和俄国农奴制改革，其相同点是 （   ）

①改革前都面临内外危机     ②农民都可以用赎买的方式得到土地

③都提倡“文明开化”     ④都通过改革走上了资本主义