“和平、统一、发展”不仅是近现代中国人民的愿望，也是全世界各国各族人民的共同愿望与追求，请根据下列史实并结合所学知识回答下列问题：

材料一：“分裂之间不能持久”，我相信我们的政府不能永远忍受一半奴役一半自由的状况。我不期望联邦解散，我不期望房子崩溃，但我却期望它停止分裂。——1858年林肯竞选演说

材料二： 实现国家统一是民族的愿望。一百年不统一，一千年也要统一的。——邓小平

材料三： 国家在必要时设立特别行政区。在特别行政区内实行的制度按照具体情况由全国人民代表大会以法律规定。——《中华人民共和国宪法》第31条

材料四： 在德国访问的温家宝总理在参观了波茨坦会议旧址后说：波茨坦会议旧址是一个对中国具有重要意义的地方，在这次会议上发表的《波茨坦公告》，明白无误地确认了台湾（包括其附属岛屿钓鱼岛和赤尾屿）是中国的一部分。二战后，台湾回归祖国，这是正义战胜邪恶的结果，也是全世界爱好和平和正义事业的国家和人民的共同胜利。一个中国的原则已成为国际共识。我相信：台湾与祖国大陆统一这一中华民族的夙愿一定会实现，这是历史的必然，是任何力量都无法阻止的。

小学有男生420人，男生比女生多 $\frac{1}{5}$ ，女生有多少人？

    Open work spaces definitely have their benefits，but they come with the drawback of offering employees little to no control over visual distractions(干扰)．With so many people around and so much going on，some of us can easily get disturbed by this information overload and lose focus in what's really important．That's where the Focus Cap comes into play．

    “As we are still cavemen or mammals kept in an unnatural environment，I believe that only by reclaiming(收回)the normal，stress-free human state through simple tools and techniques can we finally release our actual creative potential and create our meaningful work for a brighter future，”says German designer Hannes Greblin，inventor of the Focus Cap．

    After looking at other products designed at minimizing visual distractions，Greblin decided that most of them were either too expensive or too uncomfortable to become mainstream，so he decided to go with something much simpler —a simple cap with a retractable visor(可伸缩的帽沿)．

    Greblin's Focus Cap is really straightforward．You just wear it like a regular cap'with the sides of the visor retracted，and just collapse the sides whenever you need to focus on what's ahead of you．Whether you're trying to focus on a task in an open work office．Trying to study at university，or practicing yoga in a park and trying to ignore stares from strangers，the Focus Cap can help．

    To be honest，this whole project sounds like a joke，but the Focus Cap does have its own website where people interested in this unusual accessory can actually sign up for updates on when it will go on sale．Greblin claims it will cost 30 euros($37)plus shipping．