The population of the earth（）increasing fast.A、isB、areC、wereD、have been
The population of the earth（）increasing fast.
- A、is
- B、are
- C、were
- D、have been
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It can be learned from the passage that about four billion years ago ______.A. the earth was in molten stateB. the earth surface temperature was above 100℃C. the earth surface temperature was below 100℃D. rain water could remain on the earth
完形填空Many of the world’s pollution problems have been caused by the crowding of large groups of people into cities.Satisfying the 21 of the people leads to further polluting by industry.If the rapid increase in human population 22 at the present rate (比率), there may be much greater harm.Some scientists speak of the 23 in number of people as “Population Pollution”.About 2000 years ago, the world 24 was probably about 250 million.It reached a billion in 1850.By 1930 the population was two billion.It is 25 three and a half billion.It is expected to double by the year 2000.If the population continues to grow at the same 26 , there would be 25 billion people in the world a hundred years from now.Man has been using the earth’s 27 more and more rapidly over the years.Some of them are almost gone.Now many people believe that man’s greatest 28 is how to control the growth of this population.The materials in the world will not support the human population in time to come if the present rate of increase continues.29 there is over crowding in the cities and hunger in some countries.Can man’s rate of increase continue?Many people believe that human survival (幸存者) in the future 30 on the answer to the question.21.A.needsB.suppliesC.serviceD.supports22.A.stopsB.continuesC.slows downD.adds to23.A.increaseB.reduceC.countryD.improvement24.A.peopleB.situationC.populationD.land25.A.nowB.in the pastC.in the futureD.then26.A.placeB.timeC.rateD.result27.A coalB.oilC.minesD.resources28.A.problemB.powerC.planD.idea29.A.AlreadyB.YetC.StillD.Often30.A.feedsB.livesC.keepsD.depends
One day on the moon is _____.A. two Earth week longB. two Earth weeks longC. two Earth weeks longerD. two Earth weeks length
which of the following statements is not true about maori population?A. Maori population makes up nearly one-seventh of New Zealand s total population.B. Maori population is younger than the total population.C. Non-Maori women tend to have children earlier than Maori women.D. Maori women tend to have more children than non-Maori women.
Which of the following statements is NOT true?A) World population is increasing at a rate of 150 per minute.B) Lower death rates also contribute to world population growth.C) The population of Columbia has been doubling every year for 21 years.D) The United States is usually doubling its population about every 87 years.
运行下面程序,若输入 a sd in inc1 x=1 in inc1 x=1 in inc2 x=1 in inc2 x=2 in in 运行下面程序，若输入 a＜回车＞ sd＜回车＞ in inc1 x=1 in inc1 x=1 in inc2 x=1 in inc2 x=2 in inc2 x=3 fg＜回车＞则输出结果为______。 #define N 6 #include ＜stdio.h＞ main() { char c[N]； int i=0； for(;i＜N；c[i]=getchar()，i++)； for(i=0；i＜N；i++)putch8r(c[i])； printf("\n")； }A．a s d f gB．a s d fC．a sd fD．asdfg
The topic of the passage is that __.A.the control of population is essential to the development of a nationB.natural resources are important to the economic development of a countryC.awareness of the effects of man's actions is as important as population controlD. developed countries should do more to protect natural environment on the earth
Believe it or not，the day when you can go to the moon is coming soon．You can go into space (11) space shuttle．It (12) about three days for the shuttle to go from the earth to the moon． The shuttle flies a long way to a space station． You can stay there for a short rest and then it will (13) you to the moon．Now you can jump out of the shuttle． But you mustn't take (14) your spacesuit，because it is very hot in the daytime and very cold at night on the moon． The moon is much smaller than the earth． Things are (15) 0n the moon than they are on the earth． You can jump high every time you take a step． You will find that it is never tiring to walk on the moon． You don't need to take an umbrella or a raincoat with you，(16) there is no rain on the moon You can hear (17) because there is no air on the moon． And there are no animals or(18) living things there．The moon moves more slowly than the earth，so one day on the moon is as long as two weeks on the earth and one night is just as long as two weeks on the earth． What could you do in (19 )long days and nights and in a silent world?' Now scientists are trying to make the (20) 0f the moon． But our earth is really a far better place to live，as long as we take good care of it，( )11．A．onB．inC．byD．with
Passage 2If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan.Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there.Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.CarlSagan believes that Venus might be colonized from earth because__________.A. it might be possible to change its atmosphereB. its atmosphere is the same as the earth'sC. there is a good supply of water on VenusD. the days on Venus are long enough
Passage 2If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan.Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there.Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.In the long run, the most difficult problem caused by population growth on earth will probably be the lack of__________.查看材料A．foodB．oilC．spaceD．resources
Passage 2If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan.Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there.Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.CarlSagan believes that Venus might be colonized from earth because__________.查看材料A．it might be possible to change its atmosphereB．its atmosphere is the same as the earth'sC．there is a good supply of water on VenusD．the days on Venus are long enough
共用题干第二篇Human and the EarthIn terms of the evolution of life on Earth,human beings have just arrived.Despite their shori time on Earth,however,people have brought about enormous changes to the surface of the planet一changes far out of proportion to the interval of time they have occupied it.People have more control over their surroundings than any other species on Earth.With the combination of intelligence and manual skill(allowing us to make and use tools),people have found ways to use plant and animal resources,mineral ores,fuels,and many other materials and resources from the Earth.As the number of people on Earth increases,it becomes increasingly difficult for the population to survive on the resources of the land.The amount of land is limited.Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer,the land ultimately can produce only so much food and no more.As the human population grows,people consume more.Clearly,some locations on Earth already have too many people;in many of these areas,future increases will surely bring about more poverty and suffering. Yet people in rich nations use proportionally far more of the available resources than people in poorer nations.As they consume these resources without restraint,they also waste large amounts of them.People are only a very small fraction of all the living things on the planet.Yet their numbers create a drain on resources that can't be renewed.For example,the amount of water on Earth is limited,this water is cleaned through natural processes.However,the natural processes for filtering water can clean only a certain amount of water by removing the pollution.Likewise,a limited amount of petroleum can be found under the Earth's surface.Petroleum is a valuable resource.Should people use it up to manufacture petrol for automobiles?As people work to control the planet and make life comfortable,are they using up resources that are needed for their survival?Why have people more control over their surroundings than any other species on Earth?A:Because of their intelligence and manual skill.B:Because they can use plant and animal resources,mineral ores and fuels.C:Because they are cleverer than any other animals on Earth.D:Both A and B.
共用题干第二篇Human and the EarthIn terms of the evolution of life on Earth,human beings have just arrived.Despite their shori time on Earth,however,people have brought about enormous changes to the surface of the planet一changes far out of proportion to the interval of time they have occupied it.People have more control over their surroundings than any other species on Earth.With the combination of intelligence and manual skill(allowing us to make and use tools),people have found ways to use plant and animal resources,mineral ores,fuels,and many other materials and resources from the Earth.As the number of people on Earth increases,it becomes increasingly difficult for the population to survive on the resources of the land.The amount of land is limited.Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer,the land ultimately can produce only so much food and no more.As the human population grows,people consume more.Clearly,some locations on Earth already have too many people;in many of these areas,future increases will surely bring about more poverty and suffering. Yet people in rich nations use proportionally far more of the available resources than people in poorer nations.As they consume these resources without restraint,they also waste large amounts of them.People are only a very small fraction of all the living things on the planet.Yet their numbers create a drain on resources that can't be renewed.For example,the amount of water on Earth is limited,this water is cleaned through natural processes.However,the natural processes for filtering water can clean only a certain amount of water by removing the pollution.Likewise,a limited amount of petroleum can be found under the Earth's surface.Petroleum is a valuable resource.Should people use it up to manufacture petrol for automobiles?As people work to control the planet and make life comfortable,are they using up resources that are needed for their survival?in terms of the evolution of life on Earth,the history of human beings is_______.A:very short B:very longC:as long as that of other animals D:as long as that of the Earth
共用题干第二篇Human and the EarthIn terms of the evolution of life on Earth,human beings have just arrived.Despite their shori time on Earth,however,people have brought about enormous changes to the surface of the planet一changes far out of proportion to the interval of time they have occupied it.People have more control over their surroundings than any other species on Earth.With the combination of intelligence and manual skill(allowing us to make and use tools),people have found ways to use plant and animal resources,mineral ores,fuels,and many other materials and resources from the Earth.As the number of people on Earth increases,it becomes increasingly difficult for the population to survive on the resources of the land.The amount of land is limited.Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer,the land ultimately can produce only so much food and no more.As the human population grows,people consume more.Clearly,some locations on Earth already have too many people;in many of these areas,future increases will surely bring about more poverty and suffering. Yet people in rich nations use proportionally far more of the available resources than people in poorer nations.As they consume these resources without restraint,they also waste large amounts of them.People are only a very small fraction of all the living things on the planet.Yet their numbers create a drain on resources that can't be renewed.For example,the amount of water on Earth is limited,this water is cleaned through natural processes.However,the natural processes for filtering water can clean only a certain amount of water by removing the pollution.Likewise,a limited amount of petroleum can be found under the Earth's surface.Petroleum is a valuable resource.Should people use it up to manufacture petrol for automobiles?As people work to control the planet and make life comfortable,are they using up resources that are needed for their survival?Which of the following statements about resources on Earth is not correct?A:They can not be renewed.B:Water is a kind of resource which can not be renewed.C:Some of the resources are valuable.D:Many resources can be recycled so we don't need to worry about them.
共用题干第二篇Human and the EarthIn terms of the evolution of life on Earth,human beings have just arrived.Despite their shori time on Earth,however,people have brought about enormous changes to the surface of the planet一changes far out of proportion to the interval of time they have occupied it.People have more control over their surroundings than any other species on Earth.With the combination of intelligence and manual skill(allowing us to make and use tools),people have found ways to use plant and animal resources,mineral ores,fuels,and many other materials and resources from the Earth.As the number of people on Earth increases,it becomes increasingly difficult for the population to survive on the resources of the land.The amount of land is limited.Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer,the land ultimately can produce only so much food and no more.As the human population grows,people consume more.Clearly,some locations on Earth already have too many people;in many of these areas,future increases will surely bring about more poverty and suffering. Yet people in rich nations use proportionally far more of the available resources than people in poorer nations.As they consume these resources without restraint,they also waste large amounts of them.People are only a very small fraction of all the living things on the planet.Yet their numbers create a drain on resources that can't be renewed.For example,the amount of water on Earth is limited,this water is cleaned through natural processes.However,the natural processes for filtering water can clean only a certain amount of water by removing the pollution.Likewise,a limited amount of petroleum can be found under the Earth's surface.Petroleum is a valuable resource.Should people use it up to manufacture petrol for automobiles?As people work to control the planet and make life comfortable,are they using up resources that are needed for their survival?What makes people feel hard to live on Earth?A:Fertilizer. B:Lse of machinery.C:Limited land. D:Limited mineral resources.
It may be pointed out that warfare（战争）as practiced by man has no parallel in nature,This is to say that within the more highly developed animal populations of this earth,there is not now.nor has there been similar destruction within a species（物种）itself.In fact,one has to go to the lowliest forms of animal life,such as certain kinds of ants,to find anything comparable to human warfare.It is a curious fact that mankind appears to give the killing of his own kind a good reason by imaging that it is a"law of nature".There are now a lot of wrong ideas about the laws of nature,of which this is one of the most incorrect and fateful（致命的）.Political beliefs have been based upon it with results that have come near to destroying human civilization.The theory that war is a biological necessity.that it is nature′s method of controlling population and believing in the survival（生存）of the strong and the elimination（灭亡）of the weak,is totally wrong and insupportable.Within the last century.when wars have been common all over the world,the human population of the earth has almost doubled.The author of this passage seems to be the"law of nature".A.againstB.in favor ofC.uncertain ofD.very much interested in
The population of the earth（）increasing fast. One third of the population here（）workers.Ais;areBis;hasbeenCare;isDis;was
The population of the earth（）increasing fast. One third of the population here（）workers.A、is;areB、is;hasbeenC、are;isD、is;was
单选题As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.AelongationBconjunctionCoppositionDquadrature
单选题During the transition of the Earth’s magnetic field _____.Athe compass will become uselessBman and animals will be confused as to directionsCthe magnetic strength of the Earth will disappearDthe magnetic strength of the Earth will be stronger
单选题The population of the earth（）increasing fast. One third of the population here（）workers.Ais;areBis;hasbeenCare;isDis;was
问答题练习16 (1) Actually, the world’s birth rate is falling. But so is death rate, as medical advances have made it possible for man to live longer than before. Such advances have also reduced baby death rate. (2) Unless population growth is reduced, the world population may reach 12 billion in a century. Is the earth capable of providing a good life for so large a population?
单选题According to the passage, _____.Awe should not worry about the transition of the Earth’s magnetic fieldBthe Earth’s magnetic field will not change for at least 2000 yearsCthe Earth’s magnetic field has decreased its strength rapidlyDthe transition of the Earth’s magnetic field can be controlled by modern science
单选题Which statement is true about Malta’s immigrant population?AIt has a large immigrant population.BIts immigrant population is more than 3,000.CIts immigrant population totals 7,000.DIts immigrant population comes to less than 1% of the island’s 400, 000 population.
单选题According to the passage, which of the following statements is TRUE?ADifferent aspects（方面）of an urban environment, such as the crowded streets, can lead to an increase in self control.BSmall changes in urban design cannot reduce the negative side effects of city life.CFor the first time in history, the earth's population is more urban than rural.DA walk down a busy city street will improve brain performance.
单选题Aphelion is the point where the Sun（）.Aand Moon and Earth form a right angleBand Moon and Earth are in lineCcrosses the celestial equatorDis farthest from the Earth