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1、 英语六级阅读匹配考前训练及答案 A) We are surrounded by so much paper and card that it is easy to forget just how complex it is. There are many varieties and grades of paper materials, and whilst it is fairly easy to spot the varieties, it is far more difficult to spot the grades. B) It needs to be understood that
2、 most paper and card is manufactured for a specific purpose, so that whilst the corn-flake packet may look smart, it is clearly not something destined for the archives. It is made to look good, but only needs a limited life span. It is also much cheaper to manufacture than high grade card. C) Paper
3、can be made from an almost endless variety of cellulose-based material which will include many woods, cottons and grasses or which papyrus is an example and from where we get the word paper. Many of these are very specialized, but the preponderance of paper making has been from soft wood and cotton
4、or rags, with the bulk being wood-based. Paper from Wood D) In order to make wood into paper it needs to be broken down into fine strands. Firstly by powerful machinery and then boiled with strong alkalies such as caustic soda, until a fine pulp of cellulose fibers is produced. It is from this pulp
5、that the final product is made, relying on the bonding together of the cellulose into layers. That, in a very small nutshell, is the essence of paper making from wood. However, the reality is rather more complicated. In order to give us our white paper and card, the makers will add bleach and other
6、materials such as china clay and additional chemicals. E) A further problem with wood is that it contains a material that is not cellulose. Something called lignin. This is essential for the tree since it holds the cellulose fibres together, but if it is incorporated into the manufactured paper it p
7、resents archivists with a problem. Lignin eventually breaks down and releases acid products into the paper. This will weaken the bond between the cellulose fibers and the paper will become brittle and look rather brown and careworn. We have all seen this in old newspapers and cheap paperback books.
8、It has been estimated that most paper back books will have a life of not greater than fifty years. Not what we need for our archives. F) Since the lignin can be removed from the paper pulp during manufacture, the obvious question is why is it left in the paper? The answer lies in the fact that ligni
9、n makes up a considerable part of the tree. By leaving the lignin in the pulp a papermaker can increase his paper yield from a tree to some 95%. Removing it means a yield of only 35%. It is clearly uneconomic to remove the lignin for many paper and card applications. G) It also means, of course, tha
10、t lignin-free paper is going to be more expensive, but that is nevertheless what the archivist must look for in his supplies. There is no point whatsoever in carefully placing our valuable artifacts in paper or card that is going to hasten their demise. Acid is particularly harmful to photographic m
11、aterials, causing them to fade and is some cases simply vanish! H) So, how do we tell a piece of suitable paper or card from one that is unsuitable? You cannot do it by simply looking, and rather disappointingly, you cannot always rely on the label. Acid-free might be true inasmuch as a test on the
12、paper may indicate that it is a neutral material at this time. But lignin can take years before it starts the inevitable process of breaking down, and in the right conditions it will speed up enormously. I) Added to this, as I have indicated earlier, paper may also contain other materials added duri
13、ng manufacture such as bleach, china clay, chemical whiteners and size. This looks like a bleak picture, and it would be but for the fact that there are suppliers who will guarantee the material that they sell. If you want to be absolutely sure that you are storing in, or printing on, the correct ma
14、terial then this is probably the only way. J) Incidentally, acids can migrate from material to material. Lining old shoe boxes with good quality acid-free paper will do little to guard the contents. The acid will get there in the end. Paper from Rag K) Paper is also commonly made from cotton and rag
15、 waste. This has the advantage of being lignin-free, but because there is much less cotton and rag than trees, it also tends to be much more expensive than wood pulp paper. You will still need to purchase from a reliable source though, since even rag paper and card can contain undesirable additives.
16、 L) A reliable source for quality rag papers is a recognized art stockiest. Many water color artists insist on using only fine quality rag paper and board. M) The main lesson to learn from this information is that you cannot rely on purchasing archival materials from the high street. The only safe s
17、olution is to purchase from specialist suppliers. It may cost rather more, but in the end you will know that your important and valuable data and images have the best home possible. 1. The corn-flake packet is cheaper than high grade card. 2. There are a lot of materials which can be used for making
18、 paper, but the superiority ones are soft wood, cotton and rags. 3. During the whole manufacturing process, the final product is made from a pulp of cellulose fibres. 4. In order to make white paper and card, the makers will add bleach. 5. Liguin is essential for the tree but it will make paper easy
19、 to break. 6. Many paper producers will preserve lignin during manufacture, because leaving the lignin will make more paper from a tree. 7. Acid is particularly harmful to photographic materials. 8. If the lignin is removed from the paper, the paper will be more expensive. 9. Although free of lignin
20、, paper made from cotton and rag waste can also cost more money than wood pulp paper because there is much less cotton and rag than trees. 10. What we can learn from Paper from Rag is that you had better buy archival materials from specialist suppliers. 文章精要 本文主要介绍了我们寻常所见所用的纸的简单性，通过介绍用木头和破布料造纸的过程，使我
21、们对纸的类别、属性有了更深入的了解。 1.B 依据题干中的信息提示词cornflake packet，high grade card，可定位到文章其次段，该局部最终提到corn-flake packet在制造过程中比高等级的”纸(high grade card)廉价。 2.C 依据题干中的信息提示词soft wood，cotton and rags，可定位到文章第三段最终一句。 3.D 依据题干中的信息提示词final product，可将答案定位到D段，其次、三句提到最终的产品来源于纤维素纸浆。 4.D 依据题干中的信息提示词white paper and card，可将答案定位到D段，该局
22、部最终提到为了得到白纸，纸张生产者在制造过程中添加了漂bai粉和其他化学物质。 5.E 依据题干中的信息提示词essential for the tree，可将答案定位到E段，该局部提到木质素是木头的主要组成物，其作用是分散纤维素，但它会使纸张变得易碎。 6.F 依据题干中的信息提示词lignin，可将答案定位到F段，该局部最终提到很多纸张生产者在生产过程中会保存木质素，主要是由于它会增加树木的造纸产量。 7.G 依据题干中的信息提示词acid，可将答案定位到G段，该局部最终提到酸对相纸的原料尤其不利。 8.F 依据题干中的信息提示词lignin和paper可定位到文章的F段，由于该段提到，假如在纸张的生产中去除木质素，将会降低树木出产纸张的量，由此可以知道，去除了木质素的纸张价格必定会更加昂贵。 9.K 依据题干中的信息提示词cotton and rag waste可定位到文章的K段，该局部告知我们，尽管用棉花和破布料造的纸里没有木质素，但它们要比木制的纸贵许多，这是由于棉花和破布料的数量比树木少得多，由此可以得出答案。 10.M 依据题干中的信息提示词Paper from Ra9可定位到文章的最终一段，该局部提出最好到专业的供给商那里去买档案材料，由此可以得出答案