Scientists today are making greater effort to study ocean currents (洋流) . Most do it using satellites and other high-tech equipment. However, ocean expert Curtis Ebbesmeyer does it in a special way -- by studying movements of random floating garbage. A scientist with many years' experience, he started this type of research in the early 1990s when he heard about hundreds of athletic shoes washing up on the shores of the northwest coast of the United States. There were so many shoes that people were setting up swap meets to try and match left and right shoes to sell or wear.

    Ebbesmeyer found out in his researches that the shoes — about 60,000 in total — fell into the ocean in a shipping accident. He phoned the shoe company and asked if they wanted the shoes back. As expected, the company told him that they didn't. Ebbesmeyer realized this could be a great experiment. If he learned when and where the shoes went into the water and tracked where they landed, he could learn a lot about the patterns of ocean currents.

    The Pacific Northwest is one of the world's best areas for beachcombing(海滩搜寻) because winds and currents join here, and as a result, there is a group of serious beachcombers in the area. Ebbesmeyer got to know a lot of them and asked for their help in collecting information about where the shoes landed. In a year he collected reliable information on 1, 600 shoes. With this data, he and a colleague were able to test and improve a computer program designed to model ocean currents, and publish the findings of their study.

    As the result of his work, Ebbesmeyer has become known as the scientist to call with questions about any unusual objects found floating in the ocean. He has even started an association of beachcombers and ocean experts, with 500 subscribers from West Africa to New Zealand. They have recorded all lost objects ranging from potatoes to golf gloves.

    Now many young people are traveling around the world on their own, not because they have no one to travel with, but because they prefer to go alone．

     Kristina Wegscheider from California first traveled alone when she was at college and believes that it is something everyone should do at least once in their life. “It opens up your mind to new things and pushes you out of your comfort zone.” Wegscheider has visited 46 countries covering all seven continents(洲)．

    In foreign countries, with no one to help you read a map, look after you if you get ill, or lend you money if your wallet is stolen. It is challenging. This is what drives young people to travel alone．It is seen as character building and a chance to prove that they can make it on their own．

    Chris Richardson decided to leave his sales job in Australia to go traveling last year．He set up a website, The Aussie Nomad, to document（记录） his adventures. He said he wished he had traveled alone earlier. “The people you meet, the places you visit, or the things you do, everything is up to you and it forces you to grow as a person,” said the 30-year-old．

    Richardson describes traveling alone like “a shot in the arm”, which “makes you a more confident person that was ready to deal with anything”. He said: “The feeling of having conquered something on my own is a major part of what drives me each day when I'm dealing with a difficult task. I walk around with my head up because I know deep down inside that nothing is impossible if you try.”

    The great 19th century explorer John Muir once said: “Only by going alone in silence can one truly get into the heart of the wilderness.

材料一：在纳税后剩余的一切粮食、原料和饲料，农民可以全权处理……也可以用来提高个人的消费……允许在地方经济流通范围内实行交换。

——俄共（布）十大通过的关于以粮食税代替余粮收集制的决定

材料二：到1935年初，新政成为公众激烈抨击或热情支持的焦点，当时美国的保守派与大商业领袖对新政“大笔开支”“敲诈富人计划”和“社会主义”不满，批评政府抛弃自由政策，某些批评者一提到罗斯福的名字都觉得反感。对此罗斯福这般回应：“我们依靠的是旧民主秩序的新应用”

——2016年江苏卷节选

材料三：美国作家维尔斯第一次来苏联的时候，称列宁是“克里姆林宫的幻想家”，他对社会主义表示出了怀疑。1929-1933年的经济危机后，当他第二次来到苏联的时候，社会主义苏联在短短的十几年里，成功地把一个落后的农业国建设成为世界第二大工业国，他对斯大林说：“现在资本主义应该向你们学习，理解社会主义精神。”

请回答：

结合材料，完成下列问题．

材料一　不同时期户籍迁移记忆漫画．

材料二　国务院办公厅已发出通知，要求中小企业和非公有制企业招收非本地户籍的普通高校专科以上毕业生，各地城市应取消落户限制（直辖市按有关规定执行）．

材料一：硝烟战火何时了，赔款知多少？海边五口又通商，货运往来英佬把家当。江山万里应犹在，只是边疆改。问君港岛可曾留？对此只抛泪眼也无谋。

材料二：春愁难遣强看山，往事惊心泪欲潸。四百万人同一哭，去年今日割台湾。

——邱逢甲《春愁》

材料三：辛酸一九零一年，八寇强迫条约签。战火殃及到内地，国土步步被沦陷。不准反帝炮台亡，四亿多两作赔款。使馆界划东交巷，驻军北京山海关。主权严重被剥夺，中国社会陷深渊。

材料一，二，三的三首诗分别针对哪些战争和不平等条约而作？结合这三首诗，分析中国社会性质的变化。