四级六级阅读练习（41）：联合国报告：世界大城市正向“大区域化”发展_四六级阅读_英语四六级_四级六级

小编寄语：熟悉四六级阅读理解题型的同学应该都了解，英语四六级考试阅读理解材料大多选自《时代》《卫报》《今日美国》等外刊。要想阅读理解这部分拿到高分，必须在平常多阅读，掌握新词汇，锻炼阅读速度。但对于很多同学来说，如何每日在浩瀚的互联网世界寻找合适的阅读材料进行分析解读是一项很耗时间的事情。为此，　英语每日精选《卫报》《时代》等外刊上的文章供大家进行阅读练习。

【今日阅读推荐】本篇阅读材料“联合国报告：世界大城市正向“大区域化”发展”选自《卫报》（原文标题：UN report: World's biggest cities merging into 'mega-regions' 2010.3.22）。如果大家觉得比较简单，就当作泛读材料了解了解，认识几个新单词或新表达方式也不错。如果大家觉得这些材料理解上有难度，不妨当做挑战自己的拔高训练，希望大家都有进步^^

Trend towards 'endless cities' could significantly affect population and wealth in the next 50 years.

The world's mega-cities are merging to form vast "mega-regions" which may stretch hundreds of kilometres across countries and be home to more than 100 million people, according to a major new UN report.

The phenomenon of the so-called "endless city" could be one of the most significant developments - and problems - in the way people live and economies grow in the next 50 years, says UN-Habitat, the agency for human settlements, which identifies the trend of developing mega-regions in its biannual State of World Cities report.

The largest of these, says the report - launched today at the World Urban Forum in Rio de Janeiro - is the Hong Kong-Shenhzen-Guangzhou region in China, home to about 120 million people. Other mega-regions have formed in Japan and Brazil and are developing in India, west Africa and elsewhere.

The trend helped the world pass a tipping point in the last year, with more than half the world's people now living in cities.

The UN said that urbanisation is now "unstoppable". Anna Tibaijuka, outgoing director of UN-Habitat, said: "Just over half the world now lives in cities but by 2050, over 70% of the world will be urban dwellers. By then, only 17% of people in rich countries will live outside cities, and 33% in poor countries."

The development of mega-regions is regarded as generally positive, said the report's co-author Eduardo Lopez Moreno: "They [mega-regions], rather than countries, are now driving wealth."

"Research shows that the world's largest 40 mega-regions cover only a tiny fraction of the habitable surface of our planet and are home to fewer than 18% of the world's population [but] account for 66% of all economic activity and about 85% of technological and scientific innovation," said Moreno.

"The top 25 cities in the world account for more than half of the world's wealth," he added. "And the five largest cities in India and China now account for 50% of those countries' wealth."

The migration to cities, while making economic sense, is affecting the rural economy too: "Most of the wealth in rural areas already comes from people in urban areas sending money back," Moreno said.

The growth of mega-regions and cities is also leading to unprecedented urban sprawl, new slums, unbalanced development and income inequalities as more and more people move to satellite or dormitory cities.

"Cities like Los Angeles grew 45% in numbers between 1975-1990, but tripled their surface area in the same time. This sprawl is now increasingly happening in developing countries as real estate developers promote the image of a 'world-class lifestyle' outside the traditional city," say the authors.

Urban sprawl, they say, is the symptom of a divided, dysfunctional city. "It is not only wasteful, it adds to transport costs, increases energy consumption, requires more resources, and causes the loss of prime farmland."

"The more unequal that cities become, the higher the risk that economic disparities will result in social and political tension. The likelihood of urban unrest in unequal cities is high. The cities that are prospering the most are generally those that are reducing inequalities," said Moreno.

In a sample survey of world cities, the UN found the most unequal were in South Africa. Johannesburg was the least equal in the world, only marginally ahead of East London, Bloemfontein, and Pretoria.

Latin American, Asian and African cities were generally more equal, but mainly because they were uniformly poor, with a high level of slums and little sanitation. Some of the most the most egalitarian cities were found to be Dhaka and Chittagong in Bangladesh.

The US emerged as one of the most unequal societies with cities like New York, Chicago and Washington less equal than places like Brazzaville in Congo-Brazzaville, Managua in Nicaragua and Davao City in the Phillippines.

"The marginalisation and segregation of specific groups [in the US] creates a city within a city. The richest 1% of households now earns more than 72 times the average income of the poorest 20% of the population. In the 'other America', poor black families are clustered in ghettoes lacking access to quality education, secure tenure, lucrative work and political power," says the report.

The never-ending city

Cities are pushing beyond their limits and are merging into new massive conurbations known as mega-regions, which are linked both physically and economically. Their expansion drives economic growth but also leads to urban sprawl, rising inequalities and urban unrest.

The biggest mega-regions, which are at the forefront of the rapid urbanisation sweeping the world, are:

• Hong Kong-Shenhzen-Guangzhou, China, home to about 120 million people;

• Nagoya-Osaka-Kyoto-Kobe, Japan, expected to grow to 60 million people by 2017;

• Rio de Janeiro-São Paulo region with 43 million people in Brazil.

The same trend on an even larger scale is seen in fast-growing "urban corridors":

• West Africa: 600km of urbanisation linking Nigeria, Benin, Togo and Ghana, and driving the entire region's economy;

• India: From Mumbai to Dehli;

• East Asia: Four connected megalopolises and 77 separate cities of over 200,000 people each occur from Beijing to Tokyo via Pyongyang and Seoul.

【重点单词及短语】

outgoing adj. 即将离任的

account for 对……负有责任；对……做出解释；说明……的原因

urban sprawl 城市扩张；都市向郊区扩张的现象

satellite city 卫星城市

dormitory city 郊外住宅区

economic disparity 经济差距

urban unrest 城市动乱

sanitation n. 环境卫生

marginalisation n. 边缘化

segregation n. 种族隔离；隔离；分离

ghetto n. 贫民区；犹太人区

Question time:

1. What is the so-called mega-region according to the UN report?

2. Can you state the advantages and disadvantages of mega-region?

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