资料：Are walkers smarter than drivers?A report published last month says metropolitan areas in the Uni

资料：Are walkers smarter than drivers?A report published last month says metropolitan areas in the United States that were found to be more pedestrian-friendly also often had higher levels of GDP -and their citizens were better educated.The study was conducted by Smart Growth America, an urban advocacy group based in the District of Columbia. It looked at the 30 biggest metro zones in the US, and ranked them by how much office, retail, and residential area was conducive to walking.The question is, why? Do brainier people just like to walk and not drive? It's a complicated answer. What we don't know is whether walkable places attract educated people, or whether educated people move to certain places that then become more walkable.That's not all: Education levels aren't just higher in walkable cities. GDP is, too. The gap between the highest and lowest urban metros by GDP in the study is a chasm of 49%, which scholar calls a "first and second world gap. This is serious stuff."Of course, correlation doesn't equal causation. There's not enough data to definitively say why these urban areas are filled with educated people. But it's definitely a starting point for conversation: Many socioeconomic and generational trends the world over could help explain why university graduates gravitate toward crowded, subway-lined metropolises these days. In fact, such an intellectual influx has started to change the entire faces of some urban areas.Increased urbanization isn't the only reason car-eschewing cities see smarter citizens. Young people play a role, too. Millennials-those born between around 1981 and 1996-are the most educated generation in history. Nearly half of them hold a bachelor's degree or higher. They're also all moving to cities, unlike their parents. These spikes in the workforce translate into metros with higher GDP and higher overall education levels.What the positive roles played by young people?
A：They put forward proposals for using public transportation rather than private cars.
B：They realize their parents' dream of moving to cities.
C：Their workforce leads to cities with higher GDP and educational levels.
D：They contribute to cities' educational industry.
C
本题考查的是细节理解。 【关键词】positive roles played by young people 【主题句】第6自然段Young people play a role, too. Millennials-those born between around 1981 and 1996-are the most educated generation in history. Nearly half of them hold a bachelor's degree or higher. They're also all moving to cities, unlike their parents.These spikes in the workforce translate into metros with higher GDP and higher overall education levels.年轻人也发挥了作用。这群千禧一代（1981年至1996年间出生的人） 是历史上受教育程度最高的一代人。其中，近一半持有学士学位或更高学历。 与父辈不同，他们也都搬到了城市。劳动力的激增，使得大都市的GDP和整体教育水平变得更高。 【解析】本题的问题是“年轻人扮演的积极角色是什么？”。A选项“他们提出使用公共交通而不是私家车的建议。”B选项“他们实现了父母搬到城市的梦想。”C选项“他们的劳动力导致城市具有更高的GDP和教育水平。”D选项“它们为城市的教育产业做出了贡献。”根据题目中关键词找到主题句，这些年轻人的劳动力使得城市具有更高GDP和教育水平，故选C。
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