【文章內(nèi)容簡(jiǎn)介】 ng of huge industrial plexes (結(jié)合 )for the recycling of waste. The word rubbish could lose its meaning because everything that 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 inhabitants 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. Another new project is being set up to discover the best ways of sorting and separating the rubbish. When this project is plete, the rubbish will be processed like this: first, it will pass through sharp metal bars which will tear open the plastic bags in which rubbish is usually packed。 then it will pass through a powerful fan to separate the lightest elements from the heavy solids。 after that grounders and rollers break up everything that can be broken. Finally the rubbish will pass under mags, which will remove the bits of iron and steel。 the rubber and plastic will then be sorted out in the final stage. The first fullscale giant recycling plants are, perhaps, fifteen years away. Indeed, with the growing cost of transporting rubbish to more distant dumps, some big cities will be forced to build their own recycling plants before long. 64. The main purpose of the passage is ________. A. to show us a future way of recycling wastes B. to tell the importance of recycling wastes C. to warn people the danger of some wastes D. to introduce a new recycling plant 65. How many stages are there in the recycling process? A. 3. B. 4. C. 5. D. 6. 66. What is the main reason for big cities to build their own recycling plants? To deal with wastes in a better way. B. It?s a good way to gain profits. C. It?s more economical than to dump wastes in some distant places. D. Energy can be got at a lower price. 67. The first fullscale huge recycling plants ________. A. have been in existence for 15 years B. takes 15 years to build C. can?t be built until 15 years later D. will remain functioning for 15 years D Land, unlike labor and capital, has a special feature: It is in strictly fixed supply in total. Because of this, we say that its price is demanddetermined. In other words, the price of land is determined pletely by what families and firms are willing to pay for it. But not all the land is the same. Some land is more valuable than other land. The value of land to a potential user may depend upon the characteristics of the land itself or upon its location. Consider the potential uses of a piece of land in a suburb of Kansas City, Allan wants to build a clothing store in that place. He estimates that he can earn economic profits of $ 10,000 per year there because of the land?s excellent location. Bella, another person interested in buying the er, believes that she can earn $ 35,000 in economic profits if she builds a drug store there. Clearly, Bella will be more likely to get the land. Because location is often the key to profits, ?landowners are frequently able to squeeze their renters. One of the most popular locations in the Boston area, for example, is Harvard Square. There are dozens of restaurants in and around the square, and most of them are full most of the time. Despite this seeming success, most Harvard Square restaurant owners are not getting rich, because they must pay very high rents for the locations of their restaurants. A large part of the restaurant?s revenues goes to rent the land. Although the supply of land is generally perfectly fixed, the supply of land in a given use may not be so. As the population of a city grows, housing developers find themselves willing to pay more and more for land. As land bees more valuable for development, some farmers sell out, and the supply of land that can be used for development increases. 68. What?s the difference between land and other resources? A. Land?s supply is strictly fixed. B. The prices of other resources are lower. C. Land can?t be used up. D. Land is more useful. 69. Which of the following can?t determine the price of a piece of land? A. Its location. B. Its purchasers? purpose. C. The total amount of its supply for general use. D. Its features.(from ) 70. Which of the following is wron