标签：话题作文 事件 世博会
字数：800字
提要： Throughout its existence of more than 150 years, the Expo will bring new knowledge from a specific period of time and trend of development, reflecting the human civilization. The main attractions of the first session of the World Expo in 1851 in the Crystal Palace in London: almost 500 meters long palace built of cast iron and glass. Subsequently, the participating countries will offer similar..