在备考gre作文考试的时候，小编提醒大家的还是issue题库涉及社会、文化、科技、历史、、艺术等诸多方面，针对不同类型的题目作文的要求也有较大差别，所以大家在备考的时候一定要多收集多方面的材料，今天一起来看看gre作文immigration。
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Population problems are defined by the numbers and distributions of people within a physical area and by the movements of people within and between areas. For example, overpopulation of an area can contribute to food shortages, and migrations between areas can lead to inter-group conflicts. Demographers relate population statistics to sociological variables such as age, gender race and ethnicity, and socioeconomicstatus, and sociologists use this information to study the effects of population problems and policies. In the U.S. problems include, for example, the decline of cities, segregated neighborhoods, homelessness, and illegal immigration.
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