单选题What is the primary purpose of this passage?A To alert people to the dangers posed by the sun.B To discuss conditions on earth in the far future.C To present a theory about red giant stars.D To describe changes that the sun will go through.
题目
To alert people to the dangers posed by the sun.
To discuss conditions on earth in the far future.
To present a theory about red giant stars.
To describe changes that the sun will go through.
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更多“单选题What is the primary purpose of this passage?A To alert people to the dangers posed by the sun.B To discuss conditions on earth in the far future.C To present a theory about red giant stars.D To describe changes that the sun will go through.”相关问题
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第1题：
The writer's purpose when writing this passage is______.
A. to describe how pruning a tree is done
B. to discuss different ways of pruning trees
C. to give practical instructions for pruning a tree
D. to explain how a tree wound gets diseased and heals
正确答案：C45．答案为C 通过全文的介绍可知该文章讲述了修剪树木的注意事项，因此C是正确答案。
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第2题：
共用题干
第二篇
Human and the Earth
In 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.答案：C解析：文章第一段第一句话提到“就地球上生命的进化而言，人类是姗姗来迟者”，因此比较而言，人类的历史并不长。选项A是正确的。
从文章第二段第二句话“With the combination of intelligence and manual skill...”我们知道选项A和B都是正确的，因此选择D项。
文章第三段提到，土地的总量是有限的。虽然使用拖拉机等机械和施用化肥可以提高农业产量，但是土地最终所能产出的粮食只有那么多，不会再增加。因此只有选项C是正确的。
文章第四段第三句说富裕国家的人们所使用的能源在比例上远远大于贫穷国家的人们。选项C中提到的“发达国家的人们”最符合题意。
根据文章最后一段关于资源的描述我们可以发现选项A、B、C都是正确的，只有选项D的表述错误，因此选择D项。 -
第3题：
单选题What is the purpose of the passage?ATo tell people not to do dangerous sports.
BTo explain what volcano surfing and land diving are.
CTo talk about the world’s best volcano surfer and land diver.
DTo compare activities in Vanuatu with sports in New Zealand.
正确答案： D解析：
本文的脉络清晰，主要介绍了Vanuatu的两种危险的运动，即火山冲浪和陆地跳级。故选B项。 -
第4题：
单选题What will probably be the first stage of change as the sun becomes a red giant?AIts core will cool off and use less fuel.
BIts surface will become hotter and shrink.
CIt will use up its thermonuclear energy.
DIts center will grow smaller and hotter.
正确答案： A解析：
细节题。题干中的the first stage of change为关键信息，从而定位到文章第二段，该段第二句指出“距今大约五十亿年后，太阳的核会缩小并且会变得更热”，由此可知选项D为正确答案。 -
第5题：
单选题The primary purpose of the passage is to _____.Adiscuss the importance of Griffith to the development of the cinema
Bdocument Griffith’s impact on the choice of subject matter in American films
Cdeplore the state of American cinema before the advent of Griffith
Danalyze the changes in the cinema wrought by the introduction of the multi-reel film
正确答案： B解析：
通读文章可知，作者主要介绍了David W. Griffith对于电影事业的发展做出的贡献，包括电影拍摄，剪辑以及电影题材的选择等方面，B项和D项只涉及了其中的一个方面，不够全面，C项在文中没有提及，只有A项准确概括出了文章的主要目的。 -
第6题：
单选题The author’s purpose in writing the passage is _____.Ato persuade young children not to worry about criticism
Bto stress the importance of positive reinforcement to children
Cto discuss the skill of combining criticism with encouragement
Dto teach young athletes how to avoid burnout
正确答案： A解析：
主旨题。文章结尾说，父母和家长应提供正面的强化（即正面教育）而不要看重结果。研究表明，正面强化比负面的批评对学习的影响更大一些。故选B。 -
第7题：
单选题What was the author’s purpose when writing this passage? _____ATo give practical instruction for pruning a tree.
BTo give a general description of pruning.
CTo explain how trees develop diseases.
DTo discuss different methods of pruning.
正确答案： C解析：
文章讲了修剪的目的以及方法，为修剪树木提供实用的指导。 -
第8题：
单选题According to the passage, which of the following best describes the sequence of stages that the sun will probably pass through?AYellow dwarf, white dwarf, red giant, black giant.
BRed giant, white dwarf, red dwarf, nova explosion.
CYellow dwarf, red giant, white dwarf, black dwarf.
DWhite dwarf, red giant, black dwarf, yellow dwarf.
正确答案： C解析：
是非题。文章首段指出太阳目前为yellow dwarf star，第二段描述在变化的第一阶段太阳会成为red giant star，接下来第三段又指出太阳缩小后会变成white dwarf star，而文章最后一句描述太阳能量用尽后会变为black dwarf。因此太阳的演变过程是yellow dwarf, red giant, white dwarf, black dwarf，故选C。 -
第9题：
单选题The primary purpose of the passage is to _____.Awarn of the dangers of continued burning of fossil fuels
Bdiscuss the significance of the amount of carbon dioxide in the atmosphere
Cdemonstrate the usefulness of mathematical models in predicting long-range climatic change
Ddescribe the ways in which various atmospheric and climatic conditions contribute to the Earth’s weather
正确答案： D解析：
文章第一段讲述了大气中二氧化碳的存在对于保持地表温度平衡的重要作用，接着讲述了如今由于化石燃料的燃烧，使大气中的二氧化碳增多，从而对全球气温以及人类社会的影响，主要是为了强调二氧化碳在大气中的重要作用，因此B项最符合题意。A、C、D三项在文中都有所体现，但都不是文章主旨，因此不选。 -
第10题：
问答题The world of work is changing rapidly. Working conditions today are not the same as they used to be, and people no longer devote their life to doing one job for life. Write a composition of about 400 words to discuss the possible causes of these changes, and give your suggestions as to how people should prepare for work in the future.正确答案：
Vast changes are taking place in the world's labour market, so it comes as no surprise that people's views on occupations are no longer the same as before. Nowadays, many people are inclined to do one job in their lives, while others change their job frequently. How has this phenomenon come about? I believe there are several reasons.
As we are ushered into a new era, the demand for labour has shifted its focus. In the past, companies only required their employees to be loyal and to follow the supervisors' instructions to the letter. But nowadays, employees with imagination and creativity are most welcome in the job market. Therefore, the employer is always happy to see new faces and fresh ideas.
People's attitudes toward work have also altered. They tend to believe that each person has his talents in many fields. After they have devoted themselves to a particular area for a few years, they may be bored with what they have been doing all along, and would like to make endeavors in some other field for a change. Some of them assume that they can make more accomplishments in a new job, while others simply hunger for new challenges and adventures.
Finally, the world itself is changing at a bewildering pace. Some professions flourish while others slump. And there are new professions emerging every day. Thus, spurred to adapt themselves to the new, ever-changing circumstances, people will have to acquire new knowledge and skills, so that they can work in new fields and make more money.
However, there are also evident disadvantages to changing one's job frequently. Once you switch to a new profession, you have to start from scratch. For scientists, as well as engineers or doctors, long-term training is indispensable to their career. Job-hopping, therefore, is not practical for them. For people whose jobs need little special training, work experience means much more. Hopping to a new lob, they have to gather experiences in the new field from the very beginning.
Taken as a whole, it is my conclusion that people living in the present IT era have to get fully prepared for what is drawing near. It will be advantageous if they can be open-minded enough to acquire various types of knowledge and skills, and get psychologically prepared for the swift changes occurring with each passing day.解析：
文章首段陈述了现象，提出问题“为什么人们频繁换工作?”第二、三、四段分三点分析了背后可能的原因。第五段表达频繁换工作的弊端。第六段作者总结全文，根据现象提出了建议。 -
第11题：
单选题The primary purpose of Passage 1 is ______.Ato persuade the author of Passage 2 of the validity of evolutionary theory
Bto describe the process by which protein is created by hemoglobin
Cto counter a common misconception about the composition of the human body
Dto deny the practical application of macroevolutionary theory
Eto deride those who underestimate the complexity of the human body
正确答案： A解析：
作者首先提出，人们普遍认为人体是一个精致的时间机器，但他不这样认为，接着作者用血红蛋白的例子证明自己的想法，故选C项。 -
第12题：
单选题What is the purpose of the author in writing this passage?ATo stop people from drinking milk.
BTo refute the theory that milk is good for health.
CTo introduce us a new discovery on genetic mutation.
DTo infer the declination of the cattle industry.
正确答案： A解析：
文章开头指出人在成年后还能喝牛奶是很奇妙的。接着解释为什么这一现象是不正常的。进而说明是因为基因突变导致。综上所述，选C项。 -
第13题：
共用题干
第二篇
Human and the Earth
In 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.答案：D解析：文章第一段第一句话提到“就地球上生命的进化而言，人类是姗姗来迟者”，因此比较而言，人类的历史并不长。选项A是正确的。
从文章第二段第二句话“With the combination of intelligence and manual skill...”我们知道选项A和B都是正确的，因此选择D项。
文章第三段提到，土地的总量是有限的。虽然使用拖拉机等机械和施用化肥可以提高农业产量，但是土地最终所能产出的粮食只有那么多，不会再增加。因此只有选项C是正确的。
文章第四段第三句说富裕国家的人们所使用的能源在比例上远远大于贫穷国家的人们。选项C中提到的“发达国家的人们”最符合题意。
根据文章最后一段关于资源的描述我们可以发现选项A、B、C都是正确的，只有选项D的表述错误，因此选择D项。 -
第14题：
共用题干
第二篇
Human and the Earth
In 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?Who use more available resources according to the passage?
A:Rich people on Earth.
B:Poor people on Earth.
C:People in developed countries.
D:People in developing countries.答案：C解析：文章第一段第一句话提到“就地球上生命的进化而言，人类是姗姗来迟者”，因此比较而言，人类的历史并不长。选项A是正确的。
从文章第二段第二句话“With the combination of intelligence and manual skill...”我们知道选项A和B都是正确的，因此选择D项。
文章第三段提到，土地的总量是有限的。虽然使用拖拉机等机械和施用化肥可以提高农业产量，但是土地最终所能产出的粮食只有那么多，不会再增加。因此只有选项C是正确的。
文章第四段第三句说富裕国家的人们所使用的能源在比例上远远大于贫穷国家的人们。选项C中提到的“发达国家的人们”最符合题意。
根据文章最后一段关于资源的描述我们可以发现选项A、B、C都是正确的，只有选项D的表述错误，因此选择D项。 -
第15题：
单选题When the sun becomes a red giant, what will conditions be like on Earth?AIts atmosphere will freeze and become solid
BIt will be enveloped in the expanding surface of the sun.
CIt will become too hot for life to exist.
DIt will be nearly destroyed by nova explosions.
正确答案： A解析：
细节题。第二段描述最初太阳会发生的变化，该段倒数第二句指出在这一阶段太阳会变成红色的巨星，接下来最后一句提到“Temperatures on the Earth will become too hot for life to exist.”（地球上的温度会变得过热，以至于生命无法存活），故选C。 -
第16题：
单选题This passage tries to tell you how to ______.Aavoid mistakes about money and friends
B“size up” people
Cavoid mistakes in understanding what people tell you
Dkeep people friendly without trusting them
正确答案： D解析：
全文都是在就讲述我们应该学会倾听他人话语背后的真正含义，只有这样才能避免犯错，C项与原文表述一致，为正确答案。 -
第17题：
单选题What does the paragraph following the passage most probably discuss?AHow to recover your luggage
BWhere to go to continue your trip
CWhen to return to the aircraft
DHow to proceed once you are away from the aircraft
正确答案： D解析：
文章末句讲到“当你来到地面时，应尽快离开飞机，决不能在失事的飞机旁抽烟”，可推测文章以下段落会就乘客离开飞机后应怎么做进行描述，因此选D。proceed继续进行；行进。 -
第18题：
单选题What is the purpose of the author in writing the passage?ATo describe different kinds of phobias.
BTo expound phobia and their possible treatments.
CTo help the phobia sufferers to get better.
DTo tell readers how to prevent such phobias.
正确答案： C解析：
文章主旨题。文章第一段指出对恐惧症的了解带来了一系列的治疗方法，并且第三段又描述了不同类别的恐惧症，由此可知本文的主要内容是详细讲解恐惧症及可能的治疗方法。故选项B符合。 -
第19题：
单选题What is the purpose of the passage?ATo tell us just to be ourselves in social life
BTo introduce ways to learn about the world
CTo explain how people communicate with others
DTo encourage us to meet people of different kinds
正确答案： C解析：
通读最后一段可知，作者鼓励我们走出舒适区，认识不同类型的人，只有这样我们才会走出无知，避免偏见和恐惧，这样才能交到更多的朋友，过更精彩的生活（That’s how we make friends… That’s how we live an exciting life.）。因此选D项。 -
第20题：
单选题What is the passage mainly about?AFaint dwarf stars.
BThe evolution cycle of the Sun.
CThe Sun's fuel problem.
DThe dangers of invisible radiation.
正确答案： B解析： -
第21题：
单选题What is the purpose of this notice?ATo explain the upgrade policy
BTo outline the types of rooms available
CTo provide information about the room rates
DTo describe the hotel’s common facilities
正确答案： D解析：
文章第一段提到酒店提供不同种类的房间，并且可以升级到高等的套房，后面列举了很多不同的套房。所以目的是列举不同种类的房间，选择B。 -
第22题：
单选题The primary purpose of the passage is to ______.Adistinguish between serial novels and novel sequences
Bcontrast American novel sequences with that of French writers
Cexpress a critical opinion about the works of Cooper and Balzac
Dprovide an outline for the reading of Cooper’s and Balzac’s novels
Edefine and provide examples of a particular literary form
正确答案： D解析：
文段的主题句是：A novel sequence is a form prominent in the nineteenth century, in which a series of novels by an author share themes or settings or even a main character，之后内容围绕这句话展开，故E项是正确的。 -
第23题：
单选题What is the primary purpose of the passage?ATo compare and contrast two theories on the origin of the caste system in India
BTo shed some light on an aspect of Indian society that can be confusing to outsiders
CTo highlight the social injustices still faced by the Untouchable caste in India today
DTo discredit the theory that the’Arvan Invasio n, ‘brought an end to the Harappan civilization
ETo explain to the reader the distinction between the Brahman and Kshatriya castes
正确答案： E解析：
主旨题。文章主要对印度社会中社会团体的几个基本要素进行了介绍，故本题应选B项。