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填空题
Many paper producers will preserve lignin during manufacture, because leaving the lignin will make more paper from a tree.____

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解析:
根据题干中的信息“preserve lignin during manufacture”可以定位到E段“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%.”由此可知许多纸张生产者在生产过程中会保留木质素,主要是因为它会增加树木的造纸产量,故匹配段落为E。
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考题 名词解释题lignin (木质素)

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This involves adding chemicals such as caustic soda or other alkalis, soaps and detergents, water-hardening agents such as calcium chloride, frothing agents and bleaching agents. Before the recycled fibres can be made into paper they must be refined or treated in such a way that they bond together.  Most paper products must contain some virgin fibre as well as recycled fibres and unlike glass, paper cannot be recycled indefinitely. Most paper is down-cycled which means that a product made from recycled paper is of an inferior quality to the original paper. Recycling paper is beneficial in that it saves some of the energy, labour and capital that goes into producing virgin pulp. However, recycling requires the use of fossil fuel, a nonrenewable energy source, to collect the waste paper from the community and to process it to produce new paper. And the recycling process still creates emissions which require treatment before they can be disposed of safely. Nevertheless, paper recycling is an important economical and environmental practice but one which must be carried out in a rational and viable manner for it to be useful to both industry and the community.  Summary:  From the point of view of recycling, paper has two advantages over minerals and oil in that firstly it comes from a resource which is  1 and secondly it is less threatening to our environment when we throw it away because it is  2 Although Australia’s record in the re-use of waste paper is good, it is still necessary to use a combination of recycled fibre and  3 to make new paper. The paper industry has contributed positively and people have also been encouraged by the government to collect their waste on a regular basis. One major difficulty is the removal of  4 from used paper but advances are being made in this area. However, we need to learn to accept paper which is generally of a lower quality than before and to sort our waste paper by removing  5 before discarding it for collection.

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考题 填空题Lignin is essential for the tree but it will make paper easy to break.____

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考题 填空题Although free of lignin, 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.____

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考题 填空题If the lignin is removed from the paper, the paper will be more expensive.____