填空题Lignin is essential for the tree but it will make paper easy to break.____
填空题
Lignin is essential for the tree but it will make paper easy to break.____
参考解析
解析：
根据题干中的信息“essential for the tree和make paper easy to break”可以定位到D段。“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.”提到木质素是木头的主要组成物，其作用是凝聚纤维素，但它会使纸张变得易碎，故匹配段落为D。
根据题干中的信息“essential for the tree和make paper easy to break”可以定位到D段。“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.”提到木质素是木头的主要组成物，其作用是凝聚纤维素，但它会使纸张变得易碎，故匹配段落为D。
相关考题：
Which of the following is true for both bagels and donuts?A. They both came from Europe.B. They are both easy to make.C. They are both sweet.D. People in New York make them best.
49) Creating a “European identity” that respects the different cultures and traditions which go to make up the connecting fabric of the Old Continent is no easy task and demands a strategic choice -- that of producing programs in Europe for Europe.
Many wealthy people don't want to leave too much'behind mainly becauseA． it is not easy for them to make their fortunesB． they want their children to make their own wayC． they just wish their children to have a comfortable lifeD． they hope to gain reputation by donating their wealth
听力原文：The signature of the payee or of his duly authorized agent is essential to the validity of an endorsement.(7)A．The payee's signature can make the endorsement valid.B．The drawer's duly authorized agent can make the endorsement valid.C．The payer's signature can make the endorsement valid.D．The drawee's duly authorized agent can make the endorsement valid.
What will Dorothy do on weekend?A. Go out with her friends.B. Work on her paper.C. Make some plans
Passage ThreeTrees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape. The object may be to get a tree of the right height, and to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. A tree may grow healthier by removing the branches that are locking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry (进入) for diseases, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die. Pruning is usually clone in winter, for then you can see the shape of the tree clearly without the interference from the leaves.41. According to the article, which of the following statement is NOT true?A. Pruning is necessary when there are unwanted branches.B. Damage is done to a tree if it is left to grow in its own way.C. Diseased or dead branches should be cut away if they are found to rub against each other.D. Growing side branches often prevent air from moving freely.
30． Which is the best title for the passage?A． The Desert ProblemB． People Make DesertsC． Green Plants and GrassD． The Desert，the Tree and the Water
Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially forthis purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.Why is a special substance painted on the tree?A.To make a wound smooth.B.To prevent disease entering a wound.C.To cover a rough surface.D.To help a wound to dry.
Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially forthis purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.Pruning should be done to__________.A.make the tree grow tallerB.improve the shape of the treeC.get rid of the small branchesD.make the small branches thicker
Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially forthis purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.?What was the author's purpose when writing this passage?A.To give practical instruction for pruning a tree.B.To give a general description of pruning.C.To explain how trees develop diseases.D.To discuss different methods of pruning.
Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially forthis purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.Trees become unhealthy if the gardener__________.A.allows too many branches to grow in the middleB.does not protect them from windC.forces them to grow too quicklyD.damages some of the small side branches
Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially forthis purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.A good gardener prunes a tree__________.A.at intervals throughout the yearB.as quickly as possibleC.occasionally when necessaryD.regular every winter
Dr. Marsha Herbert's illustrations were clear enough to make her presentation ___understandable.A. easily B. easier C. easy D. ease
问答题Passage 2 What is paper made (Example: 0 )? When we 1 books or newspapers, we seldom stop and think about the things 2 to make them. 3 paper our lives would be very different. Paper is one of 4 important inventions（发明） of all time. The people in Egypt（埃及） first used a kind of grass-like plant to 5 paper around five 6 years ago. 3000 years later, a Chinese man created a new 7 of paper using pieces of old cloth. Then for several hundred years, people 8 the world had been using this Chinese method to make paper. In 1838, a Canadian man invented a 9 method of paper-making using wood. Today, most of the paper we use is made from 10 .例：0. A. from B. in C. of【答案】A1. A. look at B. read C. watch2. A. be used B. used C. using3. A. For B. With C. Without4. A. the most B. the better C. the worst5. A. write B. do C. make6. A. thousands of B. thousand C. thousands7. A. type B. thing C. one8. A. all over B. over C. from9. A. new B. old C. bad10. A. cloth B. grass C. wood
问答题Practice 9 Electronic mail, or e-mail, is a method of transmitting message through a computer network. Business communication by e-mail is basically the same as writing on paper. Although e-mail tends to be a more immediate and personal form of communication, the formal style, tone and language of a business letter should still be employed. Try to avoid long and complicated words and sentences in your e-mail as to make the message easy to read. Keep paragraphs short and use line spaces between paragraphs.
问答题In this section, there is one passage followed by a summary. Read the passage carefully and complete the summary below by choosing a maximum of three words from the passage to fill in the spaces 76-80. Remember to write the answers on the Answer Sheet.(10 points) Questions 1-5 are based on the following passage. Paper is different from other waste produce because it comes from a sustainable resource: trees. Unlike the minerals and oil used to make plastics and metals, trees are replaceable. Paper is also biodegradable, so it does not pose as much threat to the environment when it is discarded. While 45 out of every 100 tonnes of wood fibre used to make paper in Australia comes from waste paper, the rest comes directly from virgin fibre from forests and plantations. By world standards this is a good performance since the worldwide average is 33 per cent waste paper. Governments have encouraged waste paper collection and sorting schemes and, at the same time, the paper industry has responded by developing new recycling technologies that have paved the way for even greater utilization of used fibre. As a result, industry’s use of recycled fibres is expected to increase at twice the rate of virgin fibre over the coming years. Already, waste paper constitutes 70% of paper used for packaging, and advances in the technology required to remove ink from the paper have allowed a higher recycled content in newsprint and writing paper. To achieve the benefits of recycling, the community must also contribute. We need to accept a change in the quality of paper products; for example stationery may be less white and of a rougher texture. There also needs to be support from the community for waste paper collection programs. Not only do we need to make the paper available to collectors but it also needs to be separated into different types and sorted from contaminants such as staples, paperclips, string and other miscellaneous items. There are technical limitations to the amount of paper which can be recycled and some paper products cannot be collected for re-use. These include paper in the form of books and permanent records, photographic paper and paper which is badly contaminated. The four most common sources of paper for recycling are factories and retail stores which gather large amounts of packaging material in which goods are delivered, also offices which have unwanted business documents and computer output, paper converters and printers and lastly households which discard newspapers and packaging material. The paper manufacturer pays a price for the paper and may also incur the collection cost. Once collected, the paper has to be sorted by hand by people trained to recognize various types of paper. This is necessary because some types of paper can only be made from particular kinds of recycled fibre. The sorted paper then has to be repulped or mixed with water and broken down into its individual fibres. This mixture is called stock and may contain a wide variety of contaminating materials, particularly if it is made from mixed waste paper which has had little sorting. Various machinery is used to remove other materials from the stock. After passing through the repulping process, the fibres from printed waste paper are grey in colour because the printing ink has soaked into the individual fibres. This recycled material can only be used in products where the grey colour does not matter, such as cardboard boxes but if the grey colour is not acceptable, the fibres must be de-inked. 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.
单选题In order to attain our objective, it is essential that we will make the best use of the limited resources available.AattainBessentialCwill makeDavailable
单选题In this analogy, the author compares sentences to ______.Athe man who wrote the sentences Bwords and straight pathsCa builder’s labyrinth Dmechanisms used to make life easy
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.____
填空题Many paper producers will preserve lignin during manufacture, because leaving the lignin will make more paper from a tree.____
单选题Why is a special substance painted on the tree? _____ATo make a wound smooth.BTo prevent disease entering a wound.CTo cover a rough surface.DTo help a wound to dry.