Directions:there are 2 passages in this section. Each passage is followed by some questions or-|||-unfinished statements For each of them there are four choices marked A),B),C)and D).You-|||-should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a-|||-single line through the centre.-|||-Questions 46 to 50 are based on the following passage.-|||-With fifteen years Britain and other nations should be well on with the building of huge-|||-industrial complexes for the recycling of waste.The word rubbish could lose its meaning because-|||-everything which goes into the dumps(垃圾堆)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 as-|||-well.-|||-Another new project is being set up to discover the best ways of sorting and separating the-|||-rubbish.When this project is complete,the rubbish will be processed like this:First,it will pass-|||-through sharp metal bas 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 will break up everything that can be broken.Finally,the rubbish-|||-will pass under magnets(磁铁),which will remove the bits of iron and steel;the rubber and-|||-plastic will then be sorted out in the final stage.-|||-The first full scale 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.-|||-注意:此部分试题请在答题卡2上作答。-|||-46.The phrase"be well on with..."(Para.1,Line 1)most probably means __ --|||-A)have completed what was started-|||-B)get ready to start-|||-C)have achieved a great deal in-|||-D)put an end to-|||-47.What is NOT mentioned as a part of the recycling process described in Paragraph 3?-|||-A)Breaking up whatever is breakable.-|||-B)Sharpening metal bars.-|||-C)Separating light elements from the heavy ones.-|||-D)Sorting out small pieces of metal.-|||-48.What`s the main reason for big cities to build their own recycling plants?-|||-A)To deal with wastes in a better way.-|||-B)To protect the environment from pollution.-|||-C)To get raw materials locally.-|||-D)To get big profits from those plants-|||-49.The first full-scale huge recycling plants __ _.-|||-A)began to operate fifteen years ago-|||-B)will probably take less than fifteen years to build-|||-C)will be built fifteen years later-|||-D) will probably be in operation in fifteen years-|||-50.The passage is mainly about __ -·-|||-A)a cheap way to get energy-|||-B)the location of recycling plants-|||-C)new ways of recycling wastes-|||-D)the probably of city environment