第十五期 7-1 (7/7)-英语听力

[00:00.56]50 years ago, most people lived in rural areas. [00:06.43]But the world has changed. By some point next year, [00:10.46]more than half of all people will live in cities, [00:13.94]for the first time in history. [00:16.64]So says the most recent estimate from the United Nations. [00:20.76]City life is not always a bad thing, [00:23.92]but many experts worry about this process of urbanization. [00:28.68]A new report says it is having a huge effect on human health [00:33.51]and the quality of the environment. [00:35.71]Of the 3 billion people who live in cities now, [00:39.28]the report says, about 1 billion live in unplanned settlements.