2 . Farms of the Future

Skyscrapers(摩天大楼) are the ultimate symbol of urban life. By 2050, almost 80 percent of the earth’s population could live in cities. The human population could increase to 9.1 billion people yet the amount of land available for farming will be the same.     1    

Vertical farms, where farmers could grow crops in environmentally friendly skyscrapers, could be the solution. In spite of concerns over high costs, experts want to make these urban farms a reality and use these skyscrapers to grow crops.     2    

Vertical farms would have many advantages, experts say. The food would be grown with minimal effects on the environment. Unlike traditional farming, vertical farming would not force animals out of their habitats by taking over large areas of land, nor would it pollute the air with the use of heavy farming equipment.     3     These have been well recognized.

Growing prosperity has led to many people demanding that all foods are available all year round. Indoor farming could produce crops constantly and crops would not suffer from weather-related problems like drought or flooding. In addition, the use of agricultural chemicals for controlling insects would be minimal.

    4     They point out that although crops growing in a tall glass building would get natural sunlight during the day, it wouldn’t be enough. The plants closest to the windows would grow much more quickly than the plants further inside. The plants growing away from the windows may not produce as many or as high quality vegetables.     5     They would need additional light sources.

Experts agree that the new farming practices are needed to support the planet’s need for more and more food at affordable costs, both to the farmer and to the consumer. Vertical farms may be a small-scale answer, but the best ideas could be yet to come.

3 . Over the last 25 years, British society has changed a great deal – or at least many parts of it have.    1    . Ideas about social class – whether a person is “working - class” or “middle - class” – are one area in which changes have been extremely slow.

In the past, the working-class tended to be paid less than middle-class people. The typical working man would collect his wages on Friday evening and then, it was widely believed, having given his wife her "housekeeping", would go out and squander the rest on beer and betting.

The old style of what a middle-class man did with his money was perhaps nearer the truth. He was-and still is - inclined to take a longer-term view. Not only did he regard buying a house as a most important thing, but he also considered the education of his children as extremely important.    2    Only in very few cases did workers have the opportunity （or the education and training） to make such long-term plans.

    3    . In a large number of cases factory workers earn as much as their middle – class supervisors (管理者). Social security and laws to improve century, have made it less necessary than before to worry about "tomorrow". Working-class people seem slowly to be losing the feeling of inferiority(自卑感). In fact there has been a growing tendency in the past few years for the middle-classes to feel slightly ashamed of their position.

    4    .They generally tend to share very similar tastes in music and clothes, they spend their money in having a good time, and save for holidays or longer-term plans when necessary. There seems to be much less difference than in precious generations.    5    . As long as this gap exists, there will always be a possibility that new conflicts and jealousies will emerge, or rather that the old conflicts will re-appear, but between different groups.