六级So what factors, at the community level, do predict if poor children will move up the economic ladder as adults? What explains, for instance, why the Salt Lake City metro area is one of the 100 largest metropolitan areas most likely to lift the fortunes of the poor and the Atlanta metro area is one of the least likely?Harvard economist Raj Chetty has pointed to economic and racial segregation, community density, the size of a community's middle class, the quality of schools, community religiosity, and family structure, which he calls the single strongest correlate of upward mobility.
那么，在社区层面上，有哪些因素可以预测贫困儿童是否会在成年后的经济阶梯上上升呢？例如，是什么解释了为什么盐湖城大都会区是最有可能给穷人带来财富的100个最大大都会区之一，而亚特兰大大都会区是最不可能的地区之一？哈佛大学经济学家Raj Chetty指出了经济和种族隔离、社区密度、社区中产阶级的规模，学校的质量、社区的宗教信仰和家庭结构，他称之为向上流动的唯一最强关联。
2015年12月阅读原文
高考Buy it from a fare card machine in metro stations.
在地铁站的车票刷卡机上购买。
2014年高考英语全国卷2 阅读理解 阅读D 原文
四级with the exception of South Africa, the only light rail metro system in sub-Saharan Africa is in Addis Ababa, Ethiopia.
除南非外，撒哈拉以南非洲唯一的轻轨地铁系统位于埃塞俄比亚的亚的斯亚贝巴。
2017年12月四级真题（第三套）阅读 Section C
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