點擊查看：2017年12月大學英語六級考試閱讀理解100篇

　　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]根據(jù)題干中的high concentrations of harmful gases查找到第1段第2句。

　　解析：選項C與題干組成的因果關系與原文該句中的因果關系雖然表述不同，但內容相同，因此選項C為本題答案。選項A和選項B是high concentrations of harmful gases造成的結果，而非原因，因此不能選。

　　2.[B][定位]根據(jù)題干中的sun,wind，renewable等詞查找到第2段第2句。

　　解析：選項B與原文該句中的can never be exhausted同義，為本題答案。選項A和選項C的內容沒有在原文提及，選項D不能與題干構成相應的因果關系。

　　3.[A][定位]根據(jù)題干中的biomass查找到第2段最后一句。

　　解析：原文該句中的a major polluter indoors表明biomass主要引起室內的污染，選項A表達了與此相同的內容，故為本題答案。

　　4.[B][定位]根據(jù)題干中的數(shù)字1970s查找到第1個小標題Solar Energy下第2段最后一句。

　　解析：在四個選項中，只有選項B在原文該句中提及，其他選項都是無中生有。

　　5.[C][定位]根據(jù)題干中的大寫名詞Himalayas和專有名詞“chakki”查找到第2個小標題Hydro Power下第2段第1句。

　　解析：原文該句以居住在喜馬拉雅山的人們?yōu)槔�說明人們很早就開始“利用水力發(fā)電”了，因此，本題應選C。

　　6.[A][定位]根據(jù)題干中的remote rural areas和conventional等詞查找到第2個小標題Hydro Power下第4段首句。

　　解析：原文該句中的It指代hydro power，該句還是圍繞“水力發(fā)電”這一話題，由此可排除B、C和D選項，正確答案為A。

　　7.[D][位]根據(jù)題干中的surface，depth，ocean等詞查找到第3個小標題Energy From the Sea-Ocean Thermal,Tidal and Wave Energy下首段末句。

　　解析：在原文該句中，只有選項D的內容有提及，其他內容均沒有原文依據(jù)，因此選項D為本題答案。

　　8.[biomass]

　　[定位]根據(jù)題干中的coal，oil，gases和fourth等詞查找到笫4個小標題Biomass下第2段末句。

　　解析：空白處應為名詞詞組。題目只是將原文的主語和表語的位置倒轉，由此可見，原文中的主語biomass為本題答案。

　　9.[used geothermal hot water]

　　[定位]根據(jù)題干中的專有名詞Iceland查找到第5個小標題Geothermal Energy下末段末句。

　　解析：空白處應為定語從句的謂賓部分。原文該句中的pioneered表明冰島是首個使用地熱溫泉的地方，在回答問題的時候，注意that后應該是定語從句的謂語，由于事情發(fā)生在l943年，該謂語動詞應為過去式。

　　10.[the low-pressure steam]

　　[定位]根據(jù)題干中的conventional power plants和quantum of heat等詞查找到最后一個小標題Co-generation下第2段首句。

　　解析：空白處應為名詞詞組。在原文該句中，condensing后面并沒有帶任何賓語，但該段末句中的the low-pressure... is not condensed提示了首句中condensing的賓語應該是該句開頭的the low-pressure steam，這也就是本題答案。

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