题目内容：

    It’s common knowledge that some countries have higher life expectancies(预期寿命) than others, but the city you live in can also affect your health.

Some cities are hard on their residents. In places with poor city planning, for example Lagos, which was called out recently by the Economist Intelligence Unit, public spaces are few, making outdoor activities hard. Lack of infrastructure(基础建设) blocks the streets with cars and the air with pollutants, and residents work long hours for little money.

These are just some of the factors added up by Spotahome, a rental agency. They’ve analyzed data from a range of sources, including the World Health Organization and TripAdvisor to score each city on health, life expectancies, obesity, green space and other elements to make a list to work out which are the world’s healthiest cities.

The list is certainly Eurocentric and sunshine is seen as a positive factor. It does go some way toward suggesting which cities are getting it right in providing a good life for their residents. It may not be surprising to learn that most of the healthiest cities are in northern Europe, known for its people-first approach to city planning. The cities of Australia and Canada also do well. However, the first American city is only in 34th place. The U.K. doesn’t fare too well either—its only city in the top 50 list is London, in 40th.

Whether you’re planning a pleasant holiday, or simply wondering what your city can do better in its pursuit for happy citizens, the list of the 50 healthiest cities will give you pause for thought about the future of city planning. Here are the slender, healthy-eating, clean-aired cities that are getting it right.

1.What plays the key role in building a healthy city according to the text?

A.Local culture. B.City planning. C.Economic condition. D.Geographical position.

2.What does paragraph 3 mainly talk about?

A.How the list of the healthiest cities came into being.

B.What Spotahome discovered in the recent study.

C.The reasons why Spotahome carried out the study.

D.The places where the data of the study came from.

3.What can we learn from the text?

A.Cities in America lack enough sunshine.

B.The U. K. ranked higher than America in the list.

C.Australia and Canada have the best city planning.

D.Some people in Lagos may live a poor life.