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读下面的材料,回答1～4题。材料1:城市首位度是指一个国家或地区的最大城市和第二大城市的比值,首位度大的城市称为首位分布。城市首位度主要是用来反映一个国家和地区的城市规模结构和人口集中程度,但其应用范围不断扩大,以人口规模比较(人口首位度)为主,逐步引入到区域发展的各个领域,以经济等指标进行比较居多。有的研究者认为,城市首位度指数达到2以上才可被描述为首位城市。而首位
Read the following materials, answer questions 1 ~ 4. Material 1: The first degree in a city refers to the ratio of the largest city to the second largest city in a country or region. The first city with a large degree is called the first distribution. The first degree in cities is mainly used to reflect the urban size structure and population concentration in a country and region. However, its scope of application is constantly expanding. Based on the comparison of population size (population first degree), it is gradually introduced into all fields of regional development. Economic and other indicators to compare more. Some researchers believe that the city’s first degree index above 2 can be described as the first city. The first place