[单项选择] Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. The word rubbish could lose its meaning because everything which goes into the dumps would be made into something useful. Even the most dangerous and unpleasant wastes would provide energy if nothing else. The latest project is to take a city of around half a million residents and discover exactly what raw materials go into it and what go out. The aim is to find out how much of these raw materials could be provided if a plant for recycling waste were built just outside the city. This plant would recycle not only metal such as steel, lead and copper, but also paper and rubber as well. Another new project is being set up to discover the best ways of sorting and separating the rubbish. When this project is completed, the rubbish will be processed like this: first, it will pass through a powerful fan to separate the lightest elements fr
A. they can be of great help to the protection of environment
B. it is more expensive to process wastes in a farther dump
C. they can make the wastes into something that is useful
D. they can produce a lot of energy for the local residents

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