16世纪以来，世界各地联系越来越密切。阅读材料，回答问题。

材料一  世界贸易的中心转移了。意大利的威尼斯、热那亚等商业城市衰落了，代之而起的是里斯本、塞维尔等城市。稍后，大西洋西岸的港口更是后来居上，愈来愈占有海上贸易的中心地位。

材料二  在19世纪50－60年代，卷入世界市场的大多是农业占主导地位的国家。它们共同围绕着一个巨大的工业中心——英国。英国消费它们的原料，同时供给它们必需的工业品。

材料三  1900年，各主要资本主义国家在世界贸易中所占的比重为：英国19%，美国12%，德国13%，法国9%。从1870年至1913年，原料和工业制成品的贸易额都增加了两倍多。这说明发达国家和初级产品生产国家之间的国际分工以及世界各国之间的相互依赖程度都加强了。

材料四  世界贸易指数和贸易总额

                       ——吴于廑、齐世荣《世界史·近代史编》高等教育出版社

阅读理解

    What's your hobby? Reading，playing sports or going to the movies?Hassan has an interesting hobby．He likes collecting tropicalfish(收集热带鱼)! He keeps this hobby for 7 years．Now he is 14．There is a big aquarium(养鱼缸)in his room．It is from his parents for his 13th birthday．There are many fish in it．All of the fish are cute and beautiful．

    Hassan often travels around the world(周游世界)with his family．He loves it because he can see the underwater world in many places．He always loves the colorful underwater world．Under the water,he can see lots of tropical fish．Sometimes he can see sharks(鲨鱼)．He wants to keep one or two small sharks in an aquarium,but he can't do it at home．So Hassan goes to help in the zoo on the weekend．There he can see a lot of sharks and some other big fish．Hassan likes working in the zoo，because he can work with his favorite animals and leam more about them．

根据材料内容选择最佳答案。

—Could you please tell me       , Sonia?

    —It's on the first Tuesday of May. We hold special parties and give teachers thank—you notes that day.