四六级

　　在六级考试中，阅读部分想要拿到好成绩，不仅需要大家掌握一定的技巧还需要大家练习解题速度。速度快了，阅读不在话下。以下是小编为大家准备大家英语六级阅读练习，希望对大家有帮助。

　　Renewable Energy

　　In the past century,it has been seen that theconsumption of non-renewable sources of energyhas caused more environmental damage than anyother human activity. Electricity generated from fossil fuels such as coal and crude oil has led tohigh concentrations of harmful gases in the atmosphere.This has in turn led to many problemsbeing faced today such as ozone depletion and global warming. Vehicular pollution has alsobeen a major problem.

　　Therefore,alternative sources of energy have become very important and relevant to today'sworld.These sources,such as the sun and wind,can never be exhausted and therefore arc calledrenewable.They cause less emission and are available locally.Their use can. to a largeextent,reduce chemical,radioactive, and thermalpollution. They stand out as a viable source ofclean and limitless energy.These are also known as non-conventional sources of energy.Mostof the renewable sources of energy are fairfy non-polluting and considered clean thoughbiomass,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 andis,therefore,free.It is also the most important of the non-conventional sources of energybecause 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.Before1970,some research and development was carried out in a few countries to exploit solar energymore efficiently,but most of this work remained mainly academic.After the dramatic rise in oilprices in the 1970s,several countries began to formulate extensive research and developmentprogrammes 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 heatingwater.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 SolarPhotovoltaic(SPV)cells,solar radiation gets converted into DC electricity directly.This electricitycan either be used as it is orcan be stored in the battery.This stored electrical energy then canbe used ac night.

　　Hydro Power

　　Hydro power is one of the best,cheapest,and cleanest source of energy,although,with bigdams,there are many environmental and social problems.Small dams are,however,free fromthese problems.This is in fact one ofthe earliest known renewable energy sources.in thecountry(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 usingwater mills.or chakki,to grind wheat.Besides being free from the problem of pollution.smallhydropower plants arealso free from issues and controversies that are associated with thebigger projects.namely affecting the lives of thousands of people living along the banks of therivers.destruction of large areas under forest.and seismological threats.

　　New environmental laws affected by the danger of global warming have made energy fromsmall hydropower plants more relevant.These small hydropower piants can serve the energyneeds of remote rural areas independently.The real challenge in a remote area lies insuccessful marketing of the energy and recovering the dues.Local industries should beencouraged to use this electricity for sustainable development.

　　It is a technology with enormous potential.which could exploit the water resources to supplyenergy to remote rural areas with little access to conventional energy sources.It alsoeliminates 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 radiationequivalent to the heat content of 245 billion barrels of oil.Scientists feel that if this energy canbe tapped a large source of energy will be available to the tropical countries and to othercountries as well.The process of harnessing this energy is called OTEC(ocean thermal energyconversion).It uses the temperature differences between the surface of the ocean and thedepths 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 scalepower generators run by energy from waves of the ocean,have been used as power sources forchanncl marking buoys.

　　Biomass

　　Biomass is a renewable energy resource derived from the carbonaceous waste of various humanand natural activities.It is derived from numerous sources,including the by-products from thetimber industry.agricultural crops,raw material from the forest,major parts of household wasteand wood.

　　Biomass does not add carbon dioxide to the atmosphere as it absorbs the same amount ofcarbon in growing as it releases when consumed as a fuel. Its advantage is that it can be usedto generate electricity with the same equipment of power plants that are now burning fossilfuels.Biomass is an important source of energy and the most important fuel worldwide aftercoal,oil and natural gas.

　　Traditional use of biomass is more than its use in modern application.In the developed worldbiomass is again becoming important for applications such as combined heat and powergeneration.In addition,biomass energy is gaining significance as a source of clean heat fordomestic heating and community heating applications.In fact in countries like Finland.USA andSweden 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 earthand the sun in the sky.Our ancestors knew che value of geothermal energy;they bathed andcooked in hot springs.Today we have recognized that this resource has potential for muchbroader application.

　　The core of the earth is very hot and it is possible to make use of this geothermal energy(inGreek it means heat from the earth).These are areas where there are volcanoes.hot springs,andgeysers,and methane under the water in the oceans and seas. n some countries,such as in theUSA 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 partof thetwentieth century.For 50 years the generation of electricity from geothermal energy wasconfined to Italy and interest in this technology was slow co spread elsewhere.In 1943 the useof 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 formsof energy must always be heat and the other may be electricity or mechanical energy.In aconventional power plant,fuel is burnt in a boiler to generate high-pressure steam.Thissteam is used to drive a turbine.which in turn drives an alternator through a steam turbine toproduce electric power.The exhaust steam is generally condensed to water which goes backto the boiler.

　　As the low-pressure steam has a large quantum of heat which is lost in the process ofcondensing,the efficiency of conventional power plants is only around 35%.In a cogenerationplant,very high efficiency levels,in the range of 75%-90%,can be reached.This is so,becausethe low-pressure exhaust steam coming out of th turbine is not condensed,but used forheating purposes in factories or houses.

　　Since co-generation can meet both power and heat needs, it has otber advantages as well inthe form of significant cost savings for the plant and reduction in emissions of pollutants dueto 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______________.

　　参考答案：

　　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。

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