2018考研英语阅读经典试题及答案(15)

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2018年考研英语真题及答案解析

2018年考研英语真题及答案解析

2018年考研英语真题及答案解析考研英语最重要的就是做好真题的题海战,只有将真题啃透,才能在实战中得到更高分。

下面是小编分享的考研英语真题及答案解析,一起来看看吧。

考研英语真题及答案解析一Directions: Read the following text. Choose the best word(s) for each numbered blank and mark [A], [B], [C] or [D] on ANSWER SHEET 1. (10 points)In Cambodia, the choice of a spouse is a complex one for the young male. It may involve not only his parents and his friends, __1__those of the young woman, but also a matchmaker. A young man can __2__ a likely spouse on his own and then ask his parents to __3__the marriage negotiations, or the young man’s parents may take the choice of a spouse, giving the child little to say in the selection. __4__, a girl may veto the spouse her parents have chosen. __5__ a spouse has been selected, each family investigates the other to make sure its child is marrying __6__ a good family.The traditional wedding is a long and colorful affair. Formerly it lasted three days, __7__1980s it more commonly lasted a day and a half. Buddhist priests offer a short sermon and __8__ prayers of blessing. Par--ts of the ceremony involve ritual hair cutting,__9__cotton threads soaked in holy water around the bride's and groom's wrists, and __10__a candle around a circle of happily married and respected couples to bless the __11__. Newlyweds traditionally move in with the wife's parents and may__12__ with them up to a year, __13__they can build a new house nearby.Divorce is legal and easy to __14__, but not common.Divorced persons are __15__ with some disapproval. Each spouse retains ___16___ property he or she __17__ into the marriage, and jointly-acquired property is __18__ equally. Divorced persons may remarry, but a gender prejudice __19__up. The divorced male doesn't have a waiting period before he can remarry __20__the woman must wait ten months.1. A. by way of B. with regard to C. on behalf of D. as well as2. A. decide on B. provide for C. compete with D. adapt to3. A. close B. arrange C. renew D. postpone4. A. In theory B. Above all C. In time D. For example5. A. Unless B. Less C. After D. Although6. A. into B. within C. from D. through7. A. or B. since C. but D. so8. A. test B. copy C. recite D. create9. A. folding B. piling C. wrapping D. tying10. A. passing B. lighting C. hiding D. serving11. A. association B. meeting C. collection D. union12. A. deal B. part C. grow D. live13. A. whereas B. until C. for D. if14. A. avoid B. follow C. challenge D. obtain15. A. isolated B. persuaded C. viewed D. exposed16. A. wherever B. whatever C. whenever D. however17. A. changed B. brought C. shaped D. pushed18. A. invested B. divided C. donated D. withdrawn19. A. warms B. clears C. shows D. breaks20. A. while B. so that C. once D. in that1.[标准答案] [D]as well as[考点分析] 本题考察逻辑关系[选项分析] 因为考察逻辑关系,所以需要我们先对填空前后的原文信息做定位分析:文章身处大环境not only…..but also之中,这是一个明显的并列关系,表示“不仅……而且……”该空与前一句“his parents and his friends”也是并列关系,表示“与他本人以及伴侣的父母朋友相关” 所以答案只能是D. as well as.A. by way of通过B. with regard to 关于C. on behalf of 代表2.[标准答案] [A] decide on[考点分析] 上下文语义[选项分析] 根据该句的主语a young man与宾语a likely spouse 的关系,答案只能是A. decide on 决定。

2018年考研英语真题答案及解析

2018年考研英语真题答案及解析

2018年全国硕士研究生入学统一考试英语(一)试题答案详解Section I Use of English全文翻译:你的大脑与信任:为什么我们天生信任别人信任是一件棘手的事,一方面,(1)对很多重要的事情来说,这是一个必要条件:托儿、友情等,另一方面,把你的(2)信任放在错误的地方通常伴有高昂的(3)代价。

(4)那么,我们究竟为什么要相信别人呢?嗯,因为这样感觉很好。

(5)当人们相信一个人或一个机构时,他们的大脑会释放催产素,这是一种会(6)制造愉悦情感和激发群体集本能的激素,这种本能促使人们彼此(7)联系。

科学家发现,接触(8)到这种激素让我们处于信任的(9)情绪中:在一项瑞士的研究中,研究人员将催产素喷洒进半数受试者的鼻子里;这些人准备借给陌生人的钱的数额比吸入了其他物品的(10)对应受试者高得多。

对我们来说(11)幸运的是,我们还有识别不诚实的第六感,这可以(12)保护我们。

一项加拿大的研究发现,仅14个月大的孩子就能够将可靠的人和不诚实的人区分开来。

60个刚学步的小孩每人都被(14)介绍给一个拿着塑料容器的成人测试人员。

测试人员在看向容器里之前会问:“这里面有什么呢?”然后笑着惊叹:“哇哦!”然后邀请每一个受试者看向容器(15)里面。

一半的小孩发现有玩具;另一半(16)发现容器里是空的——然后意识到测试人员(17)欺骗了他们.在没有被戏弄的孩子中,大部分都(18)愿意同测试人员合作学习一项新技能,说明他们相信他的领导地位,(19)相比之下,同(20)“不可靠的”测试人员被配对的30个孩子中,只有5个参与了后续活动。

1、【答案】[C]for【解析】此处考察介词的用法。

it’s a necessary condition____many worthwhile things(信任是一个必要条件_____许多重要事情)此处应该是说,信任对许多重要事情来说是一个必要条件。

C选项for(对...来说)符合语义,故为正确答案;D选项from(来自于),B选项like(像...),A选项on(关于)语义不恰当,故排除。

2018考研英语二真题及答案及解析

2018考研英语二真题及答案及解析

2018考研英语二真题及答案及解析2018年考研英语二真题及答案解析Section I Use of EnglishDirections:Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET.(10 points)why do people read negative Internet comments and do other things that will obviously be painfulBecause humans have an inherent need to 1 uncertainty, according to a recent study in Psychological Science. The new research reveals that the need to know is so strong that people wiill 2 to satisfy their curiosity even when it is clear the answer will 3.In a series of four experiments, behavioral scientists at the University of Chicago and the Wisconsin School of Business tested students' willingness to 4 themselves to unpleasant stimuli in an effort to satisfy curiosity. For one 5 each participant was shown a pile of pens that the researcher claimed were from a previous experiment. The twistHalf of the pens would 6 an electric shock when clicked. Twenty-seven students were told which pens were electrified;another twe nty-seven were told only that some were electrified 7 left alone in the room, the students who did not know which ones would shock th em clicked more pens and incurred more shocks than the students who knew what would 8 .Subsequent experiments reproduced this effect wit h other stimuli, 9 the sound of fingernails on a chalkboard and pho tographs of disgusting insects.The drive to 10 is deeply rooted in humans,much the same as the ba sic drives for 11 or shelter,says Christopher Hsee of theUniversityof Chicago. Curiosity is often considered a good instinct-it can 12 new scientific advances, for instance-but sometimes such 13 can in sight that curiosity can drive you to do 14 things is a profound curiosity is possible to 15 ,however. In a final experiment,particip ants who were encouraged to 16 how they would feel after viewing an unpleasant picture were less likely to 17 to see such an results suggest that imagining the 18 of following through on one's curiosi ty ahead of time can help determine 19 it is worth the endeavor. T hinking about long-term 20 is key to reducing the possible negative effects of curiosity."Hsee other words,don't read online comments.1.8.9. than as of to10. B. forgive11.with on from to. withdrawal B. inquiry C .persistenceself-evident18.. whether20.1. 【答案】A【解析】句首作者提出疑问,“为什么人们会读互联网的负面评论和明显很让人伤心的其它事情呢”随后作者给出答案,“因为人们都有___不确定性的内在需求”。

2018考研英语阅读经典试题及答案

2018考研英语阅读经典试题及答案

2018 考研英语阅读经典试题及答案(3)新东方在线推荐:Between the eighth and eleventh centuries A. D., the Byzantine Empire staged an almost unparalleled economic and cultural revival, a recovery that is all the more striking because it followed a long period of severe internal decline. By the early eighth century, the empire had lost roughly two-thirds of the territory it had possessed in the year 600, and its remaining area was being raided by Arabs and Bulgarians, who at times threatened to take Constantinople and extinguished the empire altogether. The wealth of the state and its subjects was greatly diminished, and artistic and literary production had virtually ceased. By the early eleventh century, however, the empire had regained almost half of its lost possessions, its new frontiers were secure, and its influence extended far beyond its borders. The economy had recovered, the treasury was full, and art and scholarship had advanced.To consider the Byzantine military, cultural, and economic advances as differentiated aspects of a single phenomenon is reasonable. After all, these three forms of progress have gone together in a number of states and civilizations. Rome under Augustus and fifth-century Athens provide the most obvious examples in antiquity. Moreover, an examination of the apparent sequential connections among military, economic, and cultural forms of progress might help explain the dynamics of historical change.The common explanation of these apparent connections in the case of Byzantium would run like this: when the empire had turned back enemy raids on its own territory and had begun to raid and conquer enemy territory, Byzantine resources naturally expanded and more money became available to patronize art and literature. Therefore, Byzantine military achievements led to economic advances, which in turn led to cultural revival.No doubt this hypothetical pattern did apply at times during the course of the recovery. Yet it is not clear that military advances invariably came first. Economic advances second, and intellectual advances third. In the 860 's the Byzantine Empire began to recoverfrom Arab incursions so that by 872 the military balance with the Abbasid Caliphate had been permanently altered in the empire 's favor. The beginning of the empire 's economic revival, however, can beplaced between 810 and 830. Finally, the Byzantine revival oflearning appears to have begun even earlier. A number of notable scholars and writers appeared by 788 and, by the last decade of the eighth century, a cultural revival was in full bloom, a revival that lasted until the fall of Constantinople in 1453. Thus the commonly expected order of military revival followed by economic andthen by cultural recovery was reversed in Byzantium. In fact, the revival of Byzantine learning may itself have influenced the subsequent economic and military expansion.1. Which of the following best states the central idea of the text?[A] The Byzantine Empire was a unique case in which the usual order of military and economic revival preceding cultural revival was reversed.[B] The economic, cultural, and military revival in the Byzantine Empire between the eighth and eleventh centuries was similar in its order to the sequence of revival in Augustan Rome and fifth-century Athens.[C] After 810 Byzantine economic recovery spurred a military and, later, cultural expansion that lasted until 1453.[D] The revival of the Byzantine Empire between the eighth and eleventh centuries shows cultural rebirth preceding economic and military revival, the reverse of the generally accepted sequence of progress.2. It can be inferred from the text that the Byzantine Empire sustained significant territorial losses[A] in 600.[B] during the seventh century.[C] a century after the cultural achievements of the Byzantine Empire had been lost.[D] soon after the revival of Byzantine learning.3. In the third paragraph, the author most probably provides an explanation of the apparent connections among economic, military, and cultural development in order to[A] suggest that the process of revival in Byzantium accords with this model.[B] set up an order of events that is then shown to be not generally applicable to the case of Byzantium.[C] cast aspersions on traditional historical scholarship about Byzantium.[D] suggest that Byzantium represents a case for which no historical precedent exists.4. Which of the following does the author mention as crucial evidence concerning the manner in which the Byzantine revival began?[A] The Byzantine military revival of the 860 ' s led to economic and cultural advances.[B] The Byzantine cultural revival lasted until 1453.[C] The Byzantine economic recovery began in the 900 's.[D] The revival of Byzantine learning began toward the end of the eighth century.5. According to the author, “ The common explanation ” (line 1,paragraph 3) of connections between economic, military, and cultural development is[A] revolutionary and too new to have been applied to the history of the Byzantine Empire.[B] reasonable, but an antiquated theory of the nature of progress.[C] not applicable to the Byzantine revival as a whole, but does perhaps accurately describe limited periods during the revival.[D] equally applicable to the Byzantine case as a whole and to the history of military, economic, and cultural advances in ancient Greece and Rome.。

2018考研英语阅读理解练习题及答案

2018考研英语阅读理解练习题及答案

2018考研英语阅读理解练习题及答案2018考研英语阅读理解的复习,做练习题是必不可少的。

今天,店铺准备了2018考研英语阅读理解练习题,以供考生练习。

2018考研英语阅读理解练习题:【原文】When I decided to quit my full time employment it never occurredto me that I might become a part of a new international trend. A lateral movethat hurt my pride and blocked my professional progress prompted me to abandonmy relatively high profile career although, in the manner of a disgracedgovernment minister, I covered my exit by claimi ng “I wanted to spend more time with my family".Curiously, some two-and-a-half years and two novels later, myexperiment in what the Americans term "downshifting" has turned mytired excuse into an absolute reality. I have been transformed from apassionate advocate of the philosophy of “ have itall", preached by Linda Kelsey for the past seven years in the pages ofShe magazine, into a woman who is happy to settle for a bit of everything.I have discovered, as perhaps Kelsey will after hermuch-publicized resignation from the editorship of She after a build-up ofstress, that abandoning the doctrine of "juggling your life", andmaking the alternative move into “ downshifting ” brings with it far greater rewards than financial success andsocial status. Nothing could persuade me to return to the kind of life Kelseyused to advocate and I once enjoyed: 12-hour working days, pressured deadlines,the fearful strain of office politics and the limitations of being a parent on “ quality time ” .In America, the move away from juggling to a simpler, lessmaterialistic lifestyle is a well-established trend. Downshifting—also known in America as “voluntarysimplicity”—has, ironically, even bred a new area of what might be termedanti-consumerism. There are a number of best-selling downshifting self-helpbooks for people who want to simplify their lives; there are newsletters, suchas The Tightwad Gazette, that give hundreds of thousands of Americans usefultips on anything from recycling their cling-film to making their own soap;there are even support groups for those who want to achieve the mid-'90sequivalent of dropping out.While in America the trend started as a reaction to the economicdecline ― after the massredundancies caused by downsizing in the late’ 80s ― and is still link ed to the politics of thrift, in Britain, atleast among the middle-class downshifters of my acquaintance, we have differentreasons for seeking to simplify our lives.For the women of my generation who were urged to keep jugglingthrough the '80s, downshifting in the mid-'90s is not so much a search for themythical good life —growing your ownorganic vegetables, and risking turning into one —as apersonal recognition of your limitations.2018考研英语阅读理解练习题:【题目】37. Which of the following is true according to paragraph 1??[A]Full-time employment is a new international trend.[B]The writer was compelled by circumstances to leave her job.[C] “ A lateral move ” means stepping out of full-time employment.[D]The writer was only too eager to spend more time with herfamily.38. The writer's experiment shows that downshifting_________.[A]enables her to realize her dream[B]helps her mold a new philosophy of life[C]prompts her to abandon her high social status[D]leads her to accept the doctrine of She magazine39. “ Juggling one'slife ” probably meansliving a life characterized by _________.[A]non-materialistic lifestyle[B]a bit of everything[C]extreme stress[D]anti-consumerism40. According to the passage, downshifting emerged in the U.S. asa result of _________.[A]the quick pace of modern life[B]man's adventurous spirit[C]man's search for mythical experiences[D]the economic situation2018考研英语阅读理解练习题:【答案】名师解析37. Which of the following is true according to paragraph 1?根据第一段,下文哪一个是正确的?[A] Full-time employment is a new international trend.全职工作是一个新的国际趋势。

2018年考研英语二真题答案及解析

2018年考研英语二真题答案及解析
2018 年全国硕士研究生入学统一考试英语(二)真题答案详解
Section I Use of English
命题分析:
本文介绍了好奇心给人们带来的负面影响。文章难度不大,常考的总分结构、词汇与搭配辨析和逻辑关 系(指代、并列、转折、列举等)再次成为考点。部分段落里的长难句也在提醒考生要有基本的语法功底。 另外,本文多次出现语义的重复,对解题也有极大的帮助。
芝加哥大学的奚恺元,即这篇论文的合著者,表示(10)探索的动力在人类体内根深蒂固,与对(11) 食物或住处(shelter)的基本动力几乎相同。好奇心经常被认为是一种好的本能(instinct)——例如,它能 (12)带来新的科学进步——但有时候这种(13)探究可能会适得其反。好奇心会驱使你做(14)自我毁灭 的事情,这种洞察力(insight)是真知灼见(a profound one)。
译文识词:
人们为什么浏览网络上的负面(negative)评论,并且做其他明显会痛苦的事情呢?根据《心理科学》上 发表的一项最新研究可知,因为人们都有(1)解决不确定性的内在(inherent)需要。这项新研究揭示 (reveal):渴望了解的需求如此强烈以至于人们会(2)设法满足自己的好奇心(curiosity),即使答案很明 显会(3)令人痛苦。
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4、【答案】[D]
【解析】固定搭配题。空格位于不定式符号 to 之后,与其后的 oneself to sth.构成动词短语;空格处动作 的发出者是 students,上文表明人们为了满足好奇心,愿意去做令自己痛苦的事情,故答案为 D,表示为了满 足好奇心而让自己接触令人不悦的刺激物。
11、【答案】[D]

2018考研英语(一)真题答案与解析

2018考研英语(一)真题答案与解析

2018年全国硕士研究生入学统一考试英语(一)试题答案详解本套真题答案由海文机构提供目前仅供参考,标准答案在官方公布后会为您更新Section I Use of English1、【答案】[B] for【解析】此处考察介词的用法。

it’s a necessary condition ____ many worthwhile things (信任是一个必要条件_____许多重要事情) 此处应该是说,信任对许多重要事情来说是一个必要条件。

B选项for(对...来说)符合语义,故为正确答案;A选项from(来自于),C选项like(像...),D选项on(关于)语义不恰当,故排除。

2、【答案】[C] faith【解析】此处考察词义辨析和中心一致性原则。

第一段首句提出主题句:trust is a tricky business (信任是一个奇怪的东西)。

后面进一步对该主题句进行解释说明:On the one hand, it’s a necessary condition ___ for ___ many worthwhile things: child care, friendships, etc. (一方面,信任对许多重要事情来说是必要条件,比如照看孩子,友谊等),这句话在说信任的好处。

On the other hand, putting your ___ in the wrong place often carries a high ____. (另一方面,把...放在错误的地方往往会带来巨大...),显然这句话依旧在解释主题词“trust”,只有C选项faith(信任、忠诚)与trust属于近义词复现,故正确答案为[C] faith。

3、【答案】[B] price【解析】此处考察词义辨析。

第一段首句提出主题句:trust is a tricky business(信任是一个奇怪的东西)。

后面进一步对该主题句进行解释说明:On the one hand, it’s a necessary condition __ for __ many worthwhile things: child care, friendships, etc. (一方面,信任对许多重要事情来说是必要条件,比如照看孩子,友谊等),这句话在说信任的好处。

2018考研英语(一)真题及答案解析

2018考研英语(一)真题及答案解析

2018 年研究生入学统一考试试题(英语一)Section I Use ofEnglishDirections:Read the following text. Choose the best word (s) for each numbered blankandmark A, B, C or D on the ANSWER SHEET. (10points)WhydopeoplereadnegativeInternetcommentsanddootherthingsthatwillobviouslybe painful? Because humans have an inherent need to (1)uncertainty, accordingtoarecentstudyinPsychologicalScience.Thenewresearchrevealsthattheneedto knowissostrongthatpeoplewill (2)tosatisfytheircuriosityevenwhen it is clear the answer will (3).In a series of four experiments, behavioral scientists at the University ofChicago Booth School of Business and the Wisconsin School of Business testedstudents'willingnessto(4)themselvestounpleasantstimuliinanefforttosatisfycuriosity. Forone(5),eachparticipantwasshownapileofpensthattheresearcherclaimedwerefromapreviouse xperiment.Thetwist?Halfofthepenswould (6)an electric shock whenclicked.Twenty-seven students were told which pens were rigged; anothertwenty-seven were told only that some were electrified. (7) left alone in the room, thestudents who did not know which ones would shock them clicked more pens and incurredmorejoltsthanthestudentswhoknewwhatwould(8).Subsequentexperiments replicated this effect with other stimuli, (9) the sound of fingernails onachalkboardand photographs of disgustinginsects.The drive to (10) is deeply ingrained in humans, much the same as thebasicdrivesfor (11) or shelter, says Christopher Hsee of the University of Chicago,aco-authorofthepaper.Curiosityisoftenconsideredagoodinstinct-itcan (12) new scientific advances, for instance-but sometimes such (13) canbackfire.The insight that curiosity can drive you todo _ (14) things is a profoundone.Unhealthy curiosity is possible to (15), however. In a finalexperiment,participants who were encouraged to (16) how they would feel after viewingan unpleasant picture were less likely to (17) to see such an image. These resultssuggest that imagining the(18) of following through on one's curiosity aheadof timecanhelpdetermine(19)itisworththeendeavor."Thinkingaboutlong-term(20)iskeytomitigatingthepossiblenegativeeffectsofcuriosity,"Hseesays.In other words, don't read onlinecomments.1.A.on B.like C.for D.from2.A.faith B.concern C.attention D.interest3.A.benefit B.debt C.hope D.price4.A.Therefore B.Then C.Instead D.Again5.A.Until B.Unless C.Although D.When6.A.selects B.produces C.applies D.maintains7.A.consult B.compete C.connect D.compare8.A.at B.by C.of D.to9.A.context B.mood C.period D.circle10.A.counterparts B.substitutes C.colleagues D.supporters11.A.Funny B.Lucky C.Odd D.Ironic12.A.monitor B.protect C.surprise D.delight13.A.between B.within C.toward D.over14.A.transferred B.added C.introduced D.entrusted15.A.out B.back C.around D.inside16.A.discovered B.proved C.insisted D.remembered17.A.betrayed B.wronged C.fooled D.mocked18.A.forced B.willing C.hesitant D.entitled19. A.Incontrast B.As aresult C.On thewhole D.Forinstance20.A.inflexible B.incapable C.unreliable D.unsuitable1.【答案】C【解析】该题选择的是介词,与后面的many worthwhile things一块做后置定语修饰前面的condition,表明对于许多重要事情来说是一个必要的条件。

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2018考研英语阅读经典试题及答案(15)新东方在线推荐:As Gilbert White, Darwin, and others observed long ago, all species appear to have the innate capacity to increase their numbers from generation to generation. The task for ecologists is to untangle the environmental and biological factors that hold this intrinsic capacity for population growth in check over the long run. The great variety of dynamic behaviors exhibited by different population makes this task more difficult: some populations remain roughly constant from year to year; others exhibit regular cycles of abundance and scarcity; still others vary wildly, with outbreaks and crashes that are in some cases plainly correlated with the weather, and in other cases not.To impose some order on this kaleidoscope of patterns, one school of thought proposes dividing populations into two groups. These ecologists posit that the relatively steady populations have “density-dependent” growth parameters; that is, rates of birth, death, and migration which depend strongly on population density. The highly varying populations have “density-independent” growth parameters, with vital rates buffeted by environmental events; these rates fluctuate in a way that is wholly independent of population density.This dichotomy has its uses, but it can cause problems if taken too literally. For one thing, no population can be driven entirely by density-independent factors all the time. No matter how severely or unpredictably birth, death, and migration rates may be fluctuating around their long-term averages, if there were no density-dependent effects, the population would, in the long run, either increase or decrease without bound (barring a miracle by which gains and losses canceled exactly). Put another way, it may be that on average 99 percent of all deaths in a population arise from density-independent causes, and only one percent from factors varying with density. The factors making up the one percent may seem unimportant, and their cause may be correspondingly hard to determine. Yet, whether recognized or not, they will usually determine the long-term average population density.In order to understand the nature of the ecologist’s investigation, we may think of the density-dependent effects ongrowth parameters as the “signal” ecologists are trying to isolate and interpret, one that tends to make the population increase from relatively low values or decrease from relatively high ones, whilethe density-independent effects act to produce “noise” in the population dynamics. For populations that remain relatively constant, or that oscillate around repeated cycles, the signal can be fairly easily characterized and its effects described, even though the causative biological mechanism may remain unknown. For irregularly fluctuating populations, we are likely to have too few observationsto have any hope of extracting the signal from the overwhelming noise. But it now seems clear that all populations are regulated by amixture of density-dependent and density-independent effects in varying proportions.1. The author of the text is primarily concerned with[A] discussing two categories of factors that control population growth and assessing their relative importance.[B] describing how growth rates in natural populations fluctuate over time and explaining why these changes occur.[C] proposing a hypothesis concerning population size and suggesting ways to test it.[D] posing a fundamental question about environmental factors in population growth and presenting some currently accepted answer.2. It can be inferred from the text that the author considers the dichotomy discussed to be[A] applicable only to erratically fluctuating populations.[B] instrumental, but only if its limitations are recognized.[C] dangerously misleading in most circumstances.[D] a complete and sufficient way to account for observed phenomena.3. According to the text, all of the following behaviors havebeen exhibited by different populations EXCEPT[A] roughly constant population levels from year to year.[B] regular cycles of increases and decreases in numbers.[C] erratic increases in numbers correlated with the weather.[D] unchecked increases in numbers over many generations.4. The discussion concerning population in the third paragraph serves primarily to[A] demonstrate the difficulties ecologists face in studying density-dependent factors limiting population growth.[B] advocate more rigorous study of density-dependent factors in population growth.[C] prove that the death rates of any population are never entirely density-independent.[D] underline the importance of even small density-dependent factors in regulating long-term population densities.5. In the text, the author does all of the following EXCEPT[A] cite the views of other biologists.[B] define a basic problem that the text addresses.[C] present conceptual categories used by other biologists.[D] describe the results of a particular study.。

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