He asserted that nuclear power was a safe and non-polluting energy source.A:.maintainedB: recommendedC: consideredD: acknowledged

题目

He asserted that nuclear power was a safe and non-polluting energy source.

A:.maintained
B: recommended
C: considered
D: acknowledged

参考答案和解析

答案：A

解析：

题干意为“他断言核能是一种安全而又无污染的能源。” 句中划线词意为“主张，断言”。A项maintain意为“主张，强调”。例：He maintains that there are no short cuts to effective management．他断言，有效的管理没有捷径可走。B项意为“推荐”，C项意为“考虑”。D项意为“承认”，故选A。

更多“He asserted that nuclear power was a safe and non-polluting energy source.”相关问题

第1题

共用题干 If you made a list of all the jobs performed by the different kinds of energy,you would fill many pages.Nuclear energy is used in some areas of the United States.But there are dangers.Waste materials from nuclear______(51)would destroy life if they leaked______(52)the land.When nuclear energy is produced,a lot of______(53)is produced,too,50 a flow of lake or ocean water 15 used to cool the operations.Then the water______(54)to its source.If the returning water were too hot,it would destroy fish and other______(55).Cow manure is being used to produce a kind of______(56).The manure from farms is put into a machine to convert it to a liquid.Then the gas 15 formed______(57)a natural process.If the converter were not 50______(58)at the present time,it would be used in many places to provide______(59).Garbage has become an energy source.It______(60)to oil,steam,or electricity,or it is used on the land.But recent______(61)about power supplies has led to increased interest in the use of wind______(62)a source of electrical power.Windmills are clean and they______(63)no waste.And they use a______(64)resource.Some scientists consider that wind energy systems can fulfill a valuable______(65)in meeting the energy needs of industrialized nations and of the developing world._________(61)A:consideration B:thoughtC:concern D:interest

点击查看答案
第2题

共用题干 If you made a list of all the jobs performed by the different kinds of energy,you would fill many pages.Nuclear energy is used in some areas of the United States.But there are dangers.Waste materials from nuclear______(51)would destroy life if they leaked______(52)the land.When nuclear energy is produced,a lot of______(53)is produced,too,50 a flow of lake or ocean water 15 used to cool the operations.Then the water______(54)to its source.If the returning water were too hot,it would destroy fish and other______(55).Cow manure is being used to produce a kind of______(56).The manure from farms is put into a machine to convert it to a liquid.Then the gas 15 formed______(57)a natural process.If the converter were not 50______(58)at the present time,it would be used in many places to provide______(59).Garbage has become an energy source.It______(60)to oil,steam,or electricity,or it is used on the land.But recent______(61)about power supplies has led to increased interest in the use of wind______(62)a source of electrical power.Windmills are clean and they______(63)no waste.And they use a______(64)resource.Some scientists consider that wind energy systems can fulfill a valuable______(65)in meeting the energy needs of industrialized nations and of the developing world._________(53)A:high temperature B:hot airC:heat D:warmth

点击查看答案
第3题

He asserted that nuclear power was a safe and non一polluting energy source.A: maintainedB: recommendedC: consideredD: acknowledged

点击查看答案
第4题

共用题干 Electromagnetic Energy1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudyday it is possible to get a sunburn even though you feel cool.Visible light and the kind of energy that produce warmth and sunburn are examples of electromagnetic energy.2 The sun is 93 million miles away from the earth.Yet we can use energy from the sun because elec-tromagnetic energy travels through space.3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves. Infrared（红外线的）radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio , television , or radar. Ultraviolet rays（紫外线）and X-rays are electro- magnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings.Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel right through solid objects.They can be used to detect and treat cancer. X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the.sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed（利用）by man. Chemical energy comes from electron （电子）rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemi-cal reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium（氦）.6 Nuclear energy is beginning to compete with coal as an economical source of power to generate elec-tncity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.Paragraph 5_____________A:Nuclear Reactions as the Lasting Source of the Sun's EnergyB:The Most Important Source of EnergyC:Types of Electromagnetic EnergyD:X-rays Are Used to Detect and Treat CancerE:Seeking New Sources of EnergyF:Nuclear Energy Is Beginning to Compete With Coal

点击查看答案
第5题

共用题干 Electromagnetic Energy1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared（红外线的）radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays（紫外线）and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed（利用）by man.Chemical energy comes from electron （电子）rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium（氦）.6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.Paragraph 4______A:Nuclear Reactions as the Lasting Source of the Sun's EnergyB:The Most Important Source of EnergyC:Types of Electromagnetic EnergyD:The Machines Used for Energy GenerationE:Seeking New Sources of EnergyF:The Use of Ultravio1et Radiation in Medicine

点击查看答案
第6题

共用题干第三篇The Science of the FutureUntil recently,the"science of the future"was supposed to be electronics and artificial intelligence.Today it seems more and more likely that the next great breakthroughs in technology will be brought through a combination of those two sciences with organic chemistry and genetic engineering.This combination is the science of biotechnology.Organic chemistry enables us to produce marvelous synthetic（合成的）materials. However,it is still difficult to manufacture anything that has the capacity of wool to conserve heat and also to absorb moisture.Nothing that we have been able to produce so far comes anywhere near the combination of strength,lightness and flexibility that we find in the bodies of ordinary insects.Nevertheless,scientists in the laboratory have already succeeded in"growing"a material that has many of the characteristics of human skin.The next step may well be "biotech hearts and eyes"which can replace diseased organs in human beings.These will not be rejected by the body,as is the case with organs from humans.The application of biotechnology to energy production seems even more promising.In 1 996 the famous science-fiction writer,Arthur C. Clarke,many of whose previous predictions have come true,said that we may soon be able to develop remarkably cheap and renewable sources of energy.Some of these power sources will be biological.Clarke and others have warned us repeatedly that sooner or later we will have to give up ourdependence on non-renewable power sources.Coal,oil and gas are indeed convenient. However,using them also means creating dangerously high levels of pollution.It will be impossible to meet the growing demand for energy without increasing that pollution to catastrophic（灾难性的）levels unless we develop power sources that are both cheaper and cleaner.It is attempting to think that biotechnology or some other"science of the future"can solve our problems.Before we surrender to that temptation we should remember nuclear power.Only a few generations ago it seemed to promise limitless,cheap and safe energy.Today those promises lie buried in a concrete grave in a place called Chernobyl,in the Ukraine.Biotechnology is unlikely,however,to break its promises in quite the same or such a dangerous way.What do we learn from the last paragraph?A:Biotechnology can solve all our future energy problems.B:Biological power is cheaper than nuclear power.C:Biological power may not be as dangerous as nuclear power.D:Biological power will keep all its promises.

点击查看答案
第7题

He asserted that nuclear power was a safe and non-polluting energy source.A:maintained B:recommended C:considered D:acknowledged

点击查看答案

He asserted that nuclear power was a safe and non-polluting energy source.

题目

参考答案和解析

更多“He asserted that nuclear power was a safe and non-polluting energy source.”相关问题

第1题

第2题

第3题

第4题

第5题

第6题

第7题

相关内容