巧用反义推理提升托福阅读速度
托福阅读推理题如何提升正确率_

托福阅读推理题如何提升正确率_内容摘要:托福阅读中推理题型比较需要考生开动脑筋。
比起那些只要成功定位就能找到解题线索的题目,推理题对考生的逻从题型构成上来看,托福阅读10大题型中的推理题其实很像是细节题,似乎都是需要考生返回原文来寻找具体信息并加以解题的。
而这两种题型的不同之处在于细节题能够在原文中找到对应选项的细节,最多进行一些简单的表述形式变化,但含义却保持一致,可以说相对简单。
而推理题则需要大家在找到原文的基础上再做进一步的逻辑推理分析,正确选项代表的含义要靠大家自己思索出来,无法在原文中直接找到对应内容。
换句话说,大家需要根据文中的相关依据再往前做简单推理才能得出答案。
大家不要小看这一步推理的过程,很多同学偏偏就是不知道该怎么去进一步思考推理。
做好推理题需要类比逻辑思维举个简单的例子,像小刘一样,小王也喜欢养猫。
那么从这句话里,我们就可以通过类比思维来推断出,小刘喜欢养猫。
大家是不是觉得这也太容易了,不要小看这种推理思维,下面给大家两道来自托福官方真题中的阅读逻辑题做参考分析。
推理题类比思维解题技巧实例讲解实例1:WhatcanbeinferredaboutwhalefromthiparagraphA.Theyareconideredbyometobereptile.B.Theirbodiearebuiltinawaythathelpthemmanagee某tremelycoldtemperature.C.Theyareditantlyrelatedtoleatherbackturtle.D.Theycanwimfartherthanleatherbackturtle.思路分析:先来看一道简单一点的逻辑题,这段文字讲了某种海龟的特点,其中提到了鲸鱼,问题就是能够从这段文字中推理出什么和鲸鱼有关的信息。
根据infer这个关键词,可以看出这是一道较为明显的逻辑推理题。
这段文字一共就两句话,第一句话就类似上面举的简单例子里的“像小刘一样”的这个部分,直接把类比双方海龟和鲸鱼提了出来。
托福阅读推理题技巧

托福阅读推理题技巧托福阅读备考我们必须要掌握大量的词汇以及长难句的理解和一些背景材料,如果勤学习真题加上方法技巧,相信大家会有不错的收获。
下面是我整理的托福阅读推理题解题技巧,供同学们参照!一、推理题的标志推理题的题干中一般含有infer, imply, most likely, least likely, probably等词,分为有共性的推理题和无共性的推理题两大类。
二、推理题的做法关于无共性的推理题,也就是题干中无线索的,一般使用排除法,即依据各个选项的关键词回原文定位,通过排除法得出正确答案。
关于有共性的推理题,也就是题干中有线索的,建议考生可以先圈定题干中的关键词,依据关键词回原文定位,然后进行推理。
推理题主要有以下思路:1. 一般对比推理ETS制定推理题的手段不多,依据两个事物的对比特征出题是其中之一。
问其中一个事物的特征时,只要将与之形成对比的另一个事物的特征否定掉就可以了。
例如:It should be obvious that cetaceans, whales, porpoises, and dolphins are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land-dwelling mammals. However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses whose limbs are functional both on land and at sea), it is not easy to envision what the first whales looked like. Which of the following can be inferred from paragraph 1 about early sea otters?A. It is not difficult to imagine what they looked like.B. There were great numbers of them.C. They lived in the sea only.D. They did not leave many fossil remains.2. 时间对比推理这种思路常被考到。
托福阅读推理题答题技巧

托福阅读推理题答题技巧哎呀,托福阅读里的推理题,可真是让不少考生头疼啊!你是不是也经常抓狂,看到那些看似简单,实则考察你脑洞大开的题目,觉得自己大脑一片空白?别急,我来给你分享一些轻松有趣的答题技巧,让你在推理题面前也能泰然自若,不再紧张。
要知道,推理题不是让你去死记硬背那些阅读材料里的每个细节。
你看,文章有时候给的信息其实是有限的,很多内容需要你自己去“猜”或者“推测”。
这可不是胡乱猜测,而是根据文章给的线索,去找出最合适的答案。
就像侦探推理小说里,主角需要从一些零散的线索中找到真相,托福的推理题也是类似的,考察的其实是你对信息的整合能力。
所以啊,别一看到推理题就害怕,放松,脑袋清晰点,开始推理吧。
说到推理题,最重要的一点就是不要陷入文章的细节陷阱。
有些题目会故意让你迷失在一些不重要的细节中。
比如,文中可能提到了某个不太相关的历史事件,或者某个名字在文章中频繁出现。
你千万别以为这些内容就是答案的关键。
答案反而藏在那些看似不起眼的地方,比如文章的主题、作者的态度、段落间的逻辑关系。
你得睁大眼睛,不要被表面的信息所迷惑,挖掘出文章的深层含义。
记住一个大招:多留心作者的语气和态度。
托福阅读里的推理题可不只是单纯问“事实”类的问题,它还经常会考察你对作者态度的判断。
你有没有发现,有时候文章里有些地方,作者会用一些特定的词语,比如“显然”、“不可否认”、“绝对”等,这些词语往往代表着作者的立场。
推理题很可能会让你判断作者是持赞成态度,还是反对态度,或者是在某些问题上显得有些模棱两可。
所以,读文章的时候,要像侦探一样留心这些细节,别让任何小线索从你眼前溜走。
千万不要被题目中的“看似对立”的选项给搞晕了。
推理题经常会有两个选择看起来差不多,但实际上只有一个是最符合作者意图的。
此时,不要按自己的感觉去选,而是要回到文章中,仔细推敲,找出最符合文章整体脉络和作者观点的答案。
有些选项可能会偏离文章的主要观点,或者过于绝对化,记得不要轻易上当。
快速突破托福阅读推断题之反推法

今天,针对托福阅读中的推断题,我们为大家详细介绍其中一个方法——反推法。
一般以下三种情况可以使用反推法:1、题干中问的信息与文中找到的信息互补的时候2、文中出现绝对词3、选项信息和文中信息互补且相反关于推断题出题方式:信号词:infer(推断)suggest(暗示)imply(暗示)问题:Which of the following can be inferred about X?The author of the passage implies that X…What does paragraph#suggest about X…选项特点:不会是原文明确表述的内容,但是通过原文信息一定可以被推断出来。
举个例子:我从今天开始再也不喝奶茶了。
以上这句话大家一般会推出:我在减肥or我最近嗓子不太好不过这些都不能成为正确的选项,真正的反推应该是我之前一定有在喝奶茶,这个其实是一个很典型的反推例子。
反推的核心逻辑如果A和C构成一个互补关系,那么它们具有的特征相反。
什么情况用反推之题干中问的信息与文中找到的信息互补的时候例题一:The story of the westward movement of population in the United States is,in the main,the story of the expansion of American agriculture—of thedevelopment of new areas for the raising of livestock and the cultivation ofwheat,corn,tobacco, and cotton.After1815improved transportation enabled more and more western farmers to escape aself-sufficient way of life and enter a national market economy.During periodswhen commodity prices were high,the rate of westward migration increasedspectacularly."Old America seemed to be breaking up and movingwestward,"observed an English visitor in1817,during the first greatwave of migration.Emigration to the West reached a peak in the 1830's.Whereasin1810only a seventh of the American people lived west of the AppalachianMountains,by1840more than a third lived there.What can be inferred from paragraph1about western farmers prior to1815?A.They had limited their crop production to wheat,corn,tobacco,and cotton.B.They were able to sell their produce at high prices.C.They had not been successful in raising cattle.D.They did not operate in a national market economy.这个问题是要我们推断1815年之前西方农民的相关信息,题中有一个比较明显的标志词就是prior to1815,也就是在1815年之前,但文章中给我们的是1815年之后的时间节点。
托福阅读考试怎么提升答题的速度

托福阅读考试怎么提升答题的速度托福阅读考试怎么提升答题的速度⼀、托福阅读怎么提速 ⼀、托福阅读怎么提速 1、概括地观察 在练习时我们会读⼀些⽂章或者段⼦,⾸先我们可以进⾏略读。
对于⽂章的⾸段或者每段的内容进⾏概括,我们就可以知道这些⽂章都讲了些什么,⽽不是去通读,逐字去读,逐词去读,这样不浪费时间,⽽且对于⾃⼰的阅读能⼒的提升也是微乎其微的。
2、学会来引导阅读 当你在读托福阅读⽂章的时候,可以为⽂章的标题、副题、图⽚及⾸句设定问题,可以把它们写在各⾃⼰的位置,这样你在看问题的时候,就可以帮助你更清晰的了解⽂章的内容了。
3、学会做标记 如果在托福阅读的时候,我们如果遇到了所答问题关键词或者短语,我们要将它标记下来,并且要将它们积累起来。
因为如果这⾥考到了,说明之后也可能会考到,这些关键记号和短语就是我们平时练习时需要的积累的知识,不但在之后做阅读题或许会⽤得到,在托福考试的其它学科可能也是会⽤得到的。
4、要学会提问题 在阅读的时候,考⽣要学会提问题,在阅读完⼀个段落之后,可以在每段的句⾸位置写出⼀个问题,当你看到这个问题的就会想到这个段落讲的是什么意思。
这样不让⾃⼰的对段落有了清楚的认识,还能做到很的归纳总结的作⽤。
5、学会举⼀反三 在托福阅读的整个学习过程中,考⽣要学会类推,也就是在你完全掌握了⽂章内容之后,对于⽂章中出现的⼀些问题,我们可以把它联系到⽇常的⽣活当中,如果在⽣活当中我们会怎么样,利⽤这样的联带的关系,考⽣可以更加的对阅读⽂章时⾏融汇贯通,⼤在的提⾼⾃⼰的阅读兴趣和能⼒。
这也是托福阅读提⾼的⼀个很好的途径。
⼆、托福阅读怎么拿⾼分 ⼆、托福阅读怎么拿⾼分 托福阅读中的题型是相对较为固定的,也就是被⼤家经常提到的”托福阅读⼗⼤经典题型“。
这⼗⼤题型包括细节题、排除题、推断题、修辞⽬的题、词汇题、指代题、简化句⼦题、插⼊句⼦题、⽂章内容⼩结题、完成图表题。
对于每种题型都有着它具体的解题步骤,⼤家在每次阅读练习过程中,对于步骤都要做好梳理,阅读的提速将更加明显。
托福阅读推理题如何提升正确率

托福阅读推理题如何提升正确率托福阅读中推理题型比较需要考生开动脑筋。
比起那些只要成功定位就能找到解题线索的题目,推理题对考生的逻辑思维分析能力有更高要求。
今天给大家带来了托福阅读推理题如何提升正确率,希望能够帮助到大家,一起来学习吧。
托福阅读推理题如何提升正确率托福阅读推理题解题思路分析从题型构成上来看,托福阅读10大题型中的推理题其实很像是细节题,似乎都是需要考生返回原文来寻找具体信息并加以解题的。
而这两种题型的不同之处在于细节题能够在原文中找到对应选项的细节,最多进行一些简单的表述形式变化,但含义却保持一致,可以说相对简单。
而推理题则需要大家在找到原文的基础上再做进一步的逻辑推理分析,正确选项代表的含义要靠大家自己思索出来,无法在原文中直接找到对应内容。
换句话说,大家需要根据文中的相关依据再往前做简单推理才能得出答案。
大家不要小看这一步推理的过程,很多同学偏偏就是不知道该怎么去进一步思考推理。
做好推理题需要类比逻辑思维既然提到了逻辑思维分析推理,接下来就来为大家介绍一下托福推理题中比较常用的类比逻辑思维方式。
这种思维模式很简单,也就是*中提到两个事物,互为比较对象,而这两个事物具有一些相同的特点特征,因此可以根据A事物具有的特征来推理出B事物也具备相同的特征。
举个简单的例子,像小刘一样,小王也喜欢养猫。
那么从这句话里,我们就可以通过类比思维来推断出,小刘喜欢养猫。
大家是不是觉得这也太容易了,不要小看这种推理思维,下面给大家两道来自托福官方真题中的阅读逻辑题做参考分析。
推理题类比思维解题技巧实例讲解实例1:When it comes to physiology, the leatherback turtle is, in some ways, more like a reptilian whale than a turtle. It swims farther into the cold of the northern and southern oceans than any other sea turtle, and it deals with the chilly waters in a way unique among reptiles.What can be inferred about whales from this paragraph?A . They are considered by some to be reptiles.B. Their bodies are built in a way that helps them manage extremely cold temperatures.C .They are distantly related to leatherback turtles.D .They can swim farther than leatherback turtles.思路分析:先来看一道简单一点的逻辑题,这段文字讲了某种海龟的特点,其中提到了鲸鱼,问题就是能够从这段文字中推理出什么和鲸鱼有关的信息。
托福备考经验:阅读推理题解题策略

托福备考经验:阅读推理题解题策略如何备考托福考试更加高速有效率?如何备考托福阅读?托福阅读有什么解题技巧?小编为大家带来托福备考经验:阅读推理题解题策略,一起来看。
托福备考经验:阅读推理题解题策略1、一般对比推理:根据两个事情的对比特征,问其中一个事物的特征,只要将与之形成对比的另外一个事情的特征否定掉就可以。
2、时间对比推理:在这种推理中,一般有两个形成对比的时间段,它们所具有的特征一般相反。
当题干问一个时间段的特征时,只要将与之相反的时间段的特征否定掉就可以了。
3、集合概念推理:一个大的集合的两个方面形成对比,两者之间存在着互补性关系,也就是一个的增加意味着另一个的减少。
反之,相同。
这个比较抽象,我们来看一个例子:例如:Both the number and the percentage of people in the United States involved in nonagricultural pursuits expanded rapidly during the half century following the civil war, with some of the most dramatic increases occurring in the domains of transportation, manufacturing, and trade and distribution.What can be inferred from the passage about the agricultural sector of the economy after the Civil War?(A) New technological developments had little effect on farmers.(B) The percentage of the total population working in agriculture declined.(C) Many farms destroyed in the war were rebuilt after the war.(D) Farmers achieved new prosperity because of better rural transportation.文中指出:非农业人口的数量和比例都增加了。
托福阅读提速技巧

托福阅读提速技巧托福官方指南的第37页明确写出了阅读部分考生需要掌握的四大逻辑结构,他们分别是:Classification、comparison/contrast、cause/effect、problem/solution,以最后一个“问题/解决方法”为例,我们来感受下,官方指南上的要求是如何体现在托福考试的练习题中的。
官方放出的练习题中有一篇讲到“罗马军队对不列颠的影响”,其倒数第二题为一道句子插入题,被插入句是这样的:One solution was to keep them busy assources of labor.这句话的开头"solution"一词暗示着前文定会提到需要解决的"problem",而这一线索也成为答对这道题的关键。
这类题目背后的考点本质上就是对句间关系的把握。
句间关系把握好,不仅能提高答题的正确率,更能够提高解题的速度,一举两得。
所以,今天这篇文章呢,以托福官方指南的逻辑关系为基础,结合真实考试的要求,重点分析阅读考试中以下三大句间关系的考试规律,希望对正在备考中的莘莘学子有所启发。
句间关系1——因果关系涉及的题型有:细节题、修辞目的题、推理题、句子插入题。
因果关系在整个托福阅读中的出镜频率非常高,我曾做过一个统计,在托福给出的官方练习题中,细节题中考查到因果关系的比例高达三分之一。
所以,无论是从考试的角度,还是提高阅读力本身,掌握因果关系在句子之间的体现都是非常重要的。
以很多学生们非常熟悉的一篇文章"The origin of theaters"为例,有一道细节题问到考生为什么人们会逐渐放弃当时的"rituals"。
在定位词出现的句子中,我们会非常容易看到句子开头有一个短语叫做"as a result"。
根据题目要求,答案的出处应该就在前一句话中,而只要能够认识"detached"这个单词,考生还是能比较顺利地选出正确答案。
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巧用反义推理提升托福阅读速度大部分同学无法拿到阅读高分的核心原因是时间不够无法读全*,直接做题又感觉患得患失地不知道选择的答案是否正确符合*意思,下面就和大家分享巧用反义推理提升托福阅读速度,来欣赏一下吧。
巧用反义推理提升托福阅读速度我们来直接看题:A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species. There are three main types of symbiotic relationships: parasitism, commensalism, and mutualism. The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area.官方真题Official17 relationships="" symbiotic=""1. Which of the following statements about commensalism can be inferredfrom paragraph 1?○It excludes interactions betweenmore than two species.○It makes it l ess likely for specieswithin a community to survive.○Its significance to the organizationof biological communitiesis small.○Its role in the structure ofbiological populations is a disruptive one.?解法1:初学者在看到这样题目的时候,会先把*看完甚至翻译一遍,认为理解了自然就能选对答案。
这是正确率最高最靠谱的做法,但最大的缺陷是考试时无法在短时间内理解*并且做完题目。
所以在阅读能力不是很强的时候,尽量不要使用看完理解再做题的方法。
?解法2:定位规律? 题干关键词:commensalism? 文中定位点:There are three main types ofsymbiotic relationships: parasitism, commensalism,and mutualism.有三种共生关系:寄生、共生、互利共栖。
说的是题干关键词本身的内容,无法对应选项。
? 再往后读啊读啊读啊……理论上来说看到这里应该能得到答案了,但是……但是……看看选项?○共生关系不包括超过两个物种之间的相互作用○共生关系使得物种在生物团体中难以生存○共生关系在生物群体中的重要性是小的○共生关系在生物结构中的角色是引起混乱的选哪个?!正确答案是哪个啊?这里我们要学的是一个小套路,我们把文中内容和选项都理解后得到这样的一个逻辑:*:第一个和第三个在一个生物团体结构中是重要的;意思是,所有的有机体居住在一起并且在特定的区域相互作用。
推理模式:第一个(寄生)和第三个(互利共栖)在一个生物团体结构中是重要的→第二个(共生)是不重要的?所以选C这个切入点你发现了吗?但这样分析题目,对我们来说有什么实际的意义呢?这篇*的核心就是希望大家能高效的发现题目的切入点并且解决问题。
于是,对于这道题来说发现一个能够广泛使用的规律,比起选出正确答案更有意义:让我们聊聊刚才在题目中的推理模式:第一个(寄生)和第三个(互利共栖)在一个生物团体结构中是重要的→第二个(共生)是不重要的。
这个推理模式我叫做反义推理(有些也叫反向推理、取非,意思一致),是托福阅读推理题常用的推理模式,并且在细节题、否定事实信息题(NOTEXCEPT)和判断其他题型错误选项的时候经常使用,也是最常见的一种思维模式。
反义推理的核心来自于归约(reduction),意思是当未知量与已知量看上去无法匹配的时候,在二者之间搭上一个桥梁来使得找答案变得更简单。
让我们来看看类似题目中用到反义推理的高效表现With question such as these clearly before them, the scientists aboard the Glomar Challenger processed to the Mediterranean to search for the answers.On August 23, 1970, they recovered a sample. The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock. Not a single pebble was found that mighthave indicated that the pebbles came from the nearby continent. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetratedthe seafloor. Furthermore, the gypsum was found to possess peculiarities of composition and structure that suggested it had formed on desert flats. Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions. As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid,shiny, crystalline salt from the core barrel. Interbedded with the salt were thin layers of what appeared to be wind blown silt.官方真题Official7 mediterranean="" the="" of="" history="" geologic=""4.Which of the following can beinferred from paragraph 3 about the solid gypsum layer?○It did not contain any marine fossil.○It had formed in open-ocean conditions.○It had once been soft, deep-sea mud.○It contained sediment from nearby deserts.?解析:这道题很容易,和上一题是同样的套路? 题干关键词:the solid gypsum layer? 文中定位点:Sediment above and below the gypsumlayer contained tiny marine fossils, indicating open-ocean conditions.? 利用反义推理:在石膏层上面和下面的沉积层中包含小海洋化石→石膏层不包含海洋化石?所以选A而在我们熟练了在一个完整概念下不同因素之间的反义推理后(例如整体是【A,B,C】, 文中说AB重要则C不重要,AB有东西则C没有),将完整概念拓展到时间点前后区分概念会使得做题变得更加的简单:【Paragraph 2】Yet this most fundamental standard of historical periodization concealsa host of paradoxes. Nearly every movie theater, however modest, had a piano ororgan to provide musical accompaniment to silent pictures. In many instances,spectators in the era before recorded sound experienced elaborate auralpresentations alongside movies visual images, from the Japanese benshi(narrators) crafting multivoiced dialogue narratives to original musicalcompositions performed by symphony-size orchestras in Europe and the UnitedStates. In Berlin, for the premiere performance outside the Soviet Union of TheBattleship Potemkin, film director Sergei Eisenstein worked with Austriancomposer Edmund Meisel (1874-1930) on a musical scorematching sound to image;the Berlin screenings with live music helped to bring the film its wideinternational fame.官方真题Official12 film="" in="" sound="" to="" transition=""5. Paragraph 2 suggests which of the following about Eisenstein’s film The Battleship Potemkirf?○The film was not accompanied by sound before its Berlin screening.○The film was unpopular in the Soviet Union before it was screened in Berlin.○Eisenstein’s film was the first instance of collaboration between a director and a composer.○Eisenstein believed that the musical score in a film was as important as dialogue.?解析:? 题干关键词:Eisenstein’s film The Battleship Potemkirf,大写字母很容易找? 文中定位点:In Berlin, for the premiereperformance outside the Soviet Union of The Battleship Potemkin, film directorSergei Eisenstein worked with Austrian composer Edmund Meisel(1874-1930) on amusical score matching sound to image; the Berlin screenings with live musichelped to bring the film its wide international fame.? 利用反义推理:在柏林首次公演→在柏林之前没有演过?所以选A对我们来说,掌握了时间点前后不一致,可以使用反义推理这个方法,能让我们更快的得到答案:The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland orAntarctica. Eventually, Agassiz and others convinced geologists and the general public that a great continental glaciation had extended the polar ice caps far into regions that now enjoy temperate climates. For the first time, peoplebegan to talk about ice ages. It was also apparent that the glaciation occurred in the relatively recent past because the drift was soft, like freshly deposited sediment. We now know the age of the glaciation accurately from radiometric dating of the carbon-14 in logs buried in the drift. The drift ofthe last glaciation was deposited during one of the most recent epochs of geologic time, the Pleistocene, which lasted from 1.8 million to 10,000 yearsago. Along the east coast of the United States, the southernmost advance ofthis ice is recordedby the enormous sand and drift deposits of the terminal moraines that form Long Island and Cape Cod.官方真题Official19 the="" ages="" ice="" discovering=""5.It can be inferred from paragraph 2 that Agassiz and other geologistsof his time were not able to determine○which geographic regions had beencovered with ice sheets in the last ice age○the exact dates at which drifts hadbeen deposited during the last ice age○the exact composition of the driftslaid during the last ice age ○how far south along the east coastof the United States the ice had advanced during the last ice age?解析:? 题干关键词:Agassiz and other geologists of histimewere not able to determine? 文中定位点:We now know the age of theglaciation accurately from radiometric dating of the carbon-14 in logs buriedin the drift.? 利用反义推理:Wenow know ……→Agassiz and other geologists of histimewere not able to determine?所以选BIt was not until the Cambrian period, beginning about 600 million yearsago, that a great proliferation of macroscopic species occurred on Earth andproduced a fossil record that allows us to track the rise and fall ofbiodiversity. Since the Cambrian period, biodiversity has generally risen, butthere have been some notable exceptions. Biodiversity collapsed dramaticallyduring at least five periods because of mass extinctions around the globe. Thefive major mass extinctions receive most of the attention, but they are onlyone end of a spectrum of extinction events. Collectively, more species wentextinct during smaller events that were less dramatic but more frequent. Thebest known of the five major extinction events, the one that saw the demise ofthe dinosaurs, is the Cretaceous-Tertiary extinction.官方真题Official33 the="" of="" past="" episodes="" extinction=""2. Paragraph 1 supports which of the following statements about life onEarth before the Cambrian period?○Biodiversity levels were steady, asindicated by the fossil record.○Levels of biodiversity could not betracked.○The most dramatic extinction episodeoccurred.○Few microscopic species existed.?解析:? 题干关键词:before the Cambrian period?? 文中定位点:It was not until the Cambrian period, beginning about 600 million years ago, that a great proliferation ofmacroscopic species occurred on Earth and produced a fossil record that allowsus to track the rise and fall of biodiversity.? 利用反义推理:It was not until the Cambrian period……allows us to track the riseand fall of biodiversity→Levels of biodiversity could not betracked.?所以选B反义推理这个模式还可以被用在NOTEXCEPT题当中:Five centuries later, about 7700B.C., a new village rose on the mound.At first the inhabitants still hunted gazelle intensively. Then,。