Analysis of test questions: This question mainly examines students' accurate understanding of the achievements of the First Five-Year Plan. According to their knowledge, "No.1 Bridge" refers to Wuhan Yangtze River Bridge, "No.2 Railway" refers to baoji-chengdu railway and yingtan-Xiamen Railway, "Sanzang" refers to Xinzang Highway, Qinghai-Tibet Highway and Sichuan-Tibet Highway, and "No.4 Factory" refers to Changchun No.1 Automobile Factory, Shenyang Aircraft Factory, Anshan Iron and Steel Company and Shenyang No.1 Machine Tool Factory.