1999年,中国少年先锋队全国工作委员会与中国青少年研究中心联合开展了“当代中国少年儿童发展状况”大型调查,对6岁至14岁的城乡少年儿童进行对比研究。统计结果表明:小学1至3年级中的67.2％的城市少年儿童和45.6％的农村少年儿童每天写作业时间超过国家规定标准(30分钟);小学4至6年级中的36.8％的城市少年儿童 In 1999, the National Working Committee of China's Young Vanguard jointly conducted a large-scale survey on the state of development of children and adolescents in China with the China Youth Research Center to conduct a comparative study on children from 6 to 14 in urban and rural areas. Statistical results show that 67.2% of urban children and 45.6% of rural children in primary grades 1-3 pass the daily written assignments of more than the national standard (30 minutes); 36.8% of urban children in grade 4 to grade 6