大学英语六级CET阅读匹配训练题附解析
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大学英语六级CET阅读匹配训练题附解析 1
Renewable Energy
In the past century,it has been seen that the consumption of non-renewable sources of energy has caused more environmental damage than any other human activity. Electricity generated from fossil fuels such as coal and crude oil has led to high concentrations of harmful gases in the atmosphere.This has in turn led to many problems being faced today such as ozone depletion and global warming. Vehicular pollution has also been a major problem.
Therefore,alternative sources of energy have become very important and relevant to today's world.These sources,such as the sun and wind,can never be exhausted and therefore arc called renewable.They cause less emission and are available locally.Their use can. to a large extent,reduce chemical,radioactive, and thermalpollution. They stand out as a viable source of clean and limitless energy.These are also known as non-conventional sources of energy.Most of the renewable sources of energy are fairfy non-polluting and considered clean though biomass,a renewable source,is a major polluter indoors.
Solar Energy
Solar energy is the most readily available source of energy.It does not belong to anybody and is,therefore,free.It is also the most important of the non-conventional sources of energy because it is non-polluting and,therefore.helps in lessening the greenhouse effect.
Solar energy has been used since prehistoric times.but in a most primitive manner.Before 1970,some research and development was carried out in a few countries to exploit solar energy more efficiently,but most of this work remained mainly academic.After the dramatic rise in oil prices in the 1970s,several countries began to formulate extensive research and development programmes to exploit solar energy.
When we hang out our clothes to dry in the sun,we use the energy of the sun.In the same way, solar panels absorb the energy of the sun to provide heat for cooking and for heating water.Such systems are available in the market and are being used in homes and factories.
Solar energy can also be ursed to meet our electricity requirements.Through Solar Photovoltaic(SPV)cells,solar radiation gets converted into DC electricity directly.This electricity can either be used as it is orcan be stored in the battery.This stored electrical energy then can be used ac night.
Hydro Power
Hydro power is one of the best,cheapest,and cleanest source of energy,although,with big dams,there are many environmental and social problems.Small dams are,however,free from these problems.This is in fact one ofthe earliest known renewable energy sources.in the country(since the beginning of the 20th century).
In fact,for the last few hundred years,people living in the hills of the Himalayas have been using water mills.or chakki,to grind wheat.Besides being free from the problem of pollution.small hydropower plants arealso free from issues and controversies that are associated with the bigger projects.namely affecting the lives of thousands of people living along the banks of the rivers.destruction of large areas under forest.and seismological threats.
New environmental laws affected by the danger of global warming have made energy from small hydropower plants more relevant.These small hydropower piants can serve the energy needs of remote rural areas independently.The real challenge in a remote area lies in successful marketing of the energy and recovering the dues.Local industries should be encouraged to use this electricity for sustainable development.
It is a technology with enormous potential.which could exploit the water resources to supply energy to remote rural areas with little access to conventional energy sources.It also eliminates most of the negative environmental effects associated with large hydro projects.
Energy From the Sea-Ocean Thermal,Tidal and Wave Energy
On an averaige,the 60 million square kilometre of the tropical seas absorb solar radiation equivalent to the heat content of 245 billion barrels of oil.Scientists feel that if this energy can be tapped a large source of energy will be available to the tropical countries and to other countries as well.The process of harnessing this energy is called OTEC(ocean thermal energy conversion).It uses the temperature differences between the surface of the ocean and the depths of about lOOOm to operate a heat engine.which produces electric power.
Energy is also obtained from wavcs and tides.In some countries such as Japan small scale power generators run by energy from waves of the ocean,have been used as power sources for channcl marking buoys.
Biomass
Biomass is a renewable energy resource derived from the carbonaceous waste of various human and natural activities.It is derived from numerous sources,including the by-products from the timber industry.agricultural crops,raw material from the forest,major parts of household waste and wood.
Biomass does not add carbon dioxide to the atmosphere as it absorbs the same amount of carbon in growing as it releases when consumed as a fuel. Its advantage is that it can be used to generate electricity with the same equipment of power plants that are now burning fossil fuels.Biomass is an important source of energy and the most important fuel worldwide after coal,oil and natural gas.
Traditional use of biomass is more than its use in modern application.In the developed world biomass is again becoming important for applications such as combined heat and power generation.In addition,biomass energy is gaining significance as a source of clean heat for domestic heating and community heating applications.In fact in countries like Finland.USA and Sweden the per capita biomass energy used is higher than it is in India.China or in Asia.
Geothermal Energy
We live between two great sources of energy,the hot rocks beneath the surface of the earth and the sun in the sky.Our ancestors knew che value of geothermal energy;they bathed and cooked in hot springs.Today we have recognized that this resource has potential for much broader application.
The core of the earth is very hot and it is possible to make use of this geothermal energy(in Greek it means heat from the earth).These are areas where there are volcanoes.hot springs,and geysers,and methane under the water in the oceans and seas. n some countries,such as in the USA water is pumped from underground hot water deposits and used to heat people's houses.
The utilization of geothermal energy for the production of electricity dates back to the early part of thetwentieth century.For 50 years the generation of electricity from geothermal energy was confined to Italy and interest in this technology was slow co spread elsewhere.In 1943 the use of geothermal hot water was pioneered in lceland.
Co-generation
Co-generation is the concept or producing two forms of energy from one fuel.One of the forms of energy must always be heat and the other may be electricity or mechanical energy.In a conventional power plant,fuel is burnt in a boiler to generate high-pressure steam.This steam is used to drive a turbine.which in turn drives an alternator through a steam turbine to produce electric power.The exhaust steam is generally condensed to water which goes back to the boiler.
As the low-pressure steam has a large quantum of heat which is lost in the process of condensing,the efficiency of conventional power plants is only around 35%.In a cogeneration plant,very high efficiency levels,in the range of 75%-90%,can be reached.This is so,because the low-pressure exhaust steam coming out of th turbine is not condensed,but used for heating purposes in factories or houses.
Since co-generation can meet both power and heat needs, it has otber advantages as well in the form of significant cost savings for the plant and reduction in emissions of pollutants due to reduced fuel consumption.
1.High concentrations of harmful gases are resulted from______________.
A) ozone depletion
B) global warming
C) the consumption of fossil fuels
D) serious water and air pollution
2.The sun and wind are called renewable energy because they are____________.
A) natural
B) inexhaustible
C) newly-found
D) clean
3.Biomass,though a renewable energy,mainly causes_______________.
A) indoor pollution
B) outdoor pollution
C) industrial pollution
D) agricultural pollution
4.In the l970s,some countries began to be concerned about solar energy because of___________.
A) economic recession
B) sharp rise in oil prices
C) reduced oil production
D) increased research funds
5.In the hills of the Himalayas,“chakki”are used for_____________.
A) purifying water
B) keeping animals
C) producing power
D) exchanging goods
6.What is recommended to be used by the remote rural areas with little access to conventionalenergy sources?
A) Small hydropower plants.
B) Solar energy heaters.
C) Wind power mills.
D) Hot spring thermal energy.
7.It is mentioned that,between the surface and the depth of the ocean,there are great differences in_____________.
A) dissolved substance
B) natural resource variety
C) marine life species
D) water temperature
8.After coal oil and natural gases,the fourth most important fuel is_____________.
9.ICeland was the first counfry that______________.
10.In the conventional power plants,a large quantum of heat is lost in the process of condensing______________.
答案：
1.[C][定位]根据题干中的high concentrations of harmful gases查找到第1段第2句。
解析：选项C与题干组成的因果关系与原文该句中的因果关系虽然表述不同，但内容相同，因此选项C为本题答案。选项A和选项B是high concentrations of harmful gases造成的结果，而非原因，因此不能选。
2.[B][定位]根据题干中的sun,wind，renewable等词查找到第2段第2句。
解析：选项B与原文该句中的can never be exhausted同义，为本题答案。选项A和选项C的内容没有在原文提及，选项D不能与题干构成相应的因果关系。
3.[A][定位]根据题干中的biomass查找到第2段最后一句。
解析：原文该句中的a major polluter indoors表明biomass主要引起室内的污染，选项A表达了与此相同的内容，故为本题答案。
4.[B][定位]根据题干中的数字1970s查找到第1个小标题Solar Energy下第2段最后一句。
解析：在四个选项中，只有选项B在原文该句中提及，其他选项都是无中生有。
5.[C][定位]根据题干中的大写名词Himalayas和专有名词“chakki”查找到第2个小标题Hydro Power下第2段第1句。
解析：原文该句以居住在喜马拉雅山的人们为例说明人们很早就开始“利用水力发电”了，因此，本题应选C。
6.[A][定位]根据题干中的remote rural areas和conventional等词查找到第2个小标题Hydro Power下第4段首句。
解析：原文该句中的It指代hydro power，该句还是围绕“水力发电”这一话题，由此可排除B、C和D选项，正确答案为A。
7.[D][位]根据题干中的surface，depth，ocean等词查找到第3个小标题Energy From the Sea-Ocean Thermal,Tidal and Wave Energy下首段末句。
解析：在原文该句中，只有选项D的内容有提及，其他内容均没有原文依据，因此选项D为本题答案。
8.[biomass]
[定位]根据题干中的coal，oil，gases和fourth等词查找到笫4个小标题Biomass下第2段末句。
解析：空白处应为名词词组。题目只是将原文的主语和表语的位置倒转，由此可见，原文中的主语biomass为本题答案。
9.[used geothermal hot water]
[定位]根据题干中的专有名词Iceland查找到第5个小标题Geothermal Energy下末段末句。
解析：空白处应为定语从句的谓宾部分。原文该句中的pioneered表明冰岛是首个使用地热温泉的地方，在回答问题的时候，注意that后应该是定语从句的谓语，由于事情发生在l943年，该谓语动词应为过去式。
10.[the low-pressure steam]
[定位]根据题干中的conventional power plants和quantum of heat等词查找到最后一个小标题Co-generation下第2段首句。
解析：空白处应为名词词组。在原文该句中，condensing后面并没有带任何宾语，但该段末句中的the low-pressure... is not condensed提示了首句中condensing的宾语应该是该句开头的the low-pressure steam，这也就是本题答案。
大学英语六级CET阅读匹配训练题附解析 2
Paper--More than Meets the Eye
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 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 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 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 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 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 presents 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. 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 lignin 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, that 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 materials, 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 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 during 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 material 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 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.
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 solution 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.
阅读题
1. The corn-flake packet is cheaper than high grade card.
2. There are a lot of materials which can be used for making 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 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, 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.
答案解析：
1.B
根据题干中的信息提示词corn—flake packet,high grade card,可定位到文章第二段，该部分最后提到corn-flake packet在制造过程中比高等级的纸(high grade card)便宜.
2.C
根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后一句。
3.D
根据题干中的信息提示词final product，可将答案定位到D段，第二、三句提到最后的产品来源于纤维素纸浆。
4.D
根据题干中的信息提示词white paper and card，可将答案定位到D段，该部分最后提到为了得到白纸，纸张生产者在制造过程中添加了漂白粉和其他化学物质。
5.E
根据题干中的信息提示词essential for the tree，可将答案定位到E段，该部分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。
6.F
根据题干中的信息提示词lignin，可将答案定位到F段，该部分最后提到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。
7.G
根据题干中的'信息提示词acid，可将答案定位到G段，该部分最后提到酸对相纸的原料尤其不利。
8.F
根据题干中的信息提示词lignin和paper可定位到文章的F段，因为该段提到，如果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
根据题干中的信息提示词cotton and rag waste可定位到文章的K段，该部分告诉我们，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很多，这是因为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
根据题干中的信息提示词Paper from Ra9可定位到文章的最后一段，该部分提出最好到专业的供应商那里去买档案材料，由此可以得出答案
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