【最新】考研英语(完形填空语法)及单词整理

考研英语语法练习题【附答案详解】

考研英语语法练习题【附答案详解】 1. —How did you get in touch with the travel agent, Robin? —Oh, that’s easy. I surfed the Internet and then called one ________ the telephone number is provided. A. which B. in which C. of which D. whose 2. October 15th is my birthday, ________ I will never forget. A. when B. that C. what D. which 3. The treatment will continue until the patient reaches the point ________ he can walk correctly and safely. A. when B. where C. which D. whose 4. There are several research centers in China ________ a certain disease called Bird Flu is being studied. A. which B. where C. when D. what 5. I hope that the little ________ I have been able to do does good to them all. A. which B. what C. that D. when 6. The time is not far away ________ modern communications will become widespread in China’s vast countryside. A. as B. when C. until D. before 7. ________ is known to everybody, Taiwan is a part of China. We must unify it.

考研英语语法大全———自己总结

考研英语十二大基础语法体系对于任何英语句子，要分析其结构，这样才能找到英语语言的规律。每种语言都有它的难点，汉语的难点在于汉语不是拼读语言，汉字很难写，而且有四种声调。其实，许多接触过多种外语的人都认为，英语的语法比法语、德语、俄语、日语等都简单，是最容易学的。著名语言学家乔姆斯基说过，语法是内生的、也就是随着语言的诞生而诞生的。因此，学习语法和学习语言是相辅相成的。一、英语动词的时态（一）英汉两种语言在时态表达方式上的差异：英语的词类与汉语的不同。汉语词类形态稳定，比如“书”这个字，“一本书”、“三本书”都一样，没有词形变化。英语就不同了，book, books仅从词形上就能知道是单数还是复数。动词是英语中变化最多、最复杂的词类。有人说，学好英语就是学好动词，此言甚是。同一个动作或状态分别在不同时间发生或存在，表达这个动作或状态的动词就要用不同的形式，这就是时态。（二）英语动词的形式：英语的时态是通过动词的变化来体现的。因此，了解动词的形式及其变化规律非常重要。英语的实义动词有以下五种形式： (1)动词原形：动词原形在句子中形式不变。主要用于主语为非第三人称单数的一般现在时，情态动词之后，或根据语法规定必须用动词原形的其他情况。 (2) 一般现在时第三人称单数形式（简称现单三）：主要用于主语为第三人称单数的一般现在时。 (3) 过去式：主要用于一般过去时。 (4) 现在分词：主要用于进行时态，或语法规定的其他情况。 (5) 过去分词：主要用于完成时态，或语法规定的其他情况。动词一般现在时第三人称单数（现单三）的构成，见下表：

即某些字母组合的不规则动词有一定的规律。如：weep→wept, sleep→slept, sweep→swept 以上每个时间段中分别有四种状态：一般、进行、完成和完成进行。因此我们便有了四四一十六个时态。态（一般、进行、完成、完成进行）。比如在“They are doing their exercises.”这个句子中，动词由原形do 变成are doing 的形态，说明这个事情是发生在现在、并处于正在进行的状态当中，所以叫现在进行时；在“They have done their exercises.”这句中，动词由原形do 变成have done的形态，说明这个事情是发生在现在、并处于完成的状态，所以叫现在完成时；在“They always do their exercises.”中，动词用原形do 的形态，说明这个事情是发生在现在、并且是一般情况下永远如此，所以叫一般现在时。在这三句话中，动词do 虽然用了不同的形态，其意义没有变化，而是事情发生的时间和状态变了。其余类推。（三）时态详解 16个时态中，常用的有12个：一般现在时、一般过去时、一般将来时、过去将来时、现在进行时、过去进行时、将来进行时、现在完成时、过去完成时、将来完成时、现在完成进行时和过去完成进行时。其他时态很少单独使用。下面把各种时态的构成和用法做一个全面的介绍。

2005-2015年历年考研英语一完形填空真题

The human nose is an underrated tool.Humans are often thought to be insensitive smellers compared with animals,1 this is largely because,2 animals,we stand upright.This means that our noses are 3 to perceiving those smells which float through the air,4 the majority of smells which stick to surfaces.In fact5,we are extremely sensitive to smells,6 we do not generally realize it.Our noses are capable of 7 human smells even when these are 8 to far below one part in one million. Strangely,some people find that they can smell one type of flower but not another,9 others are sensitive to the smells of both flowers.This may be because some people do not have the genes necessary to generate 10 smell receptors in the nose.These receptors are the cells which sense smells and send 11 to the brain.However,it has been found that even people insensitive to a certain smell 12 can suddenly become sensitive to it when 13 to it often enough. The explanation for insensitivity to smell seems to be that brain finds it 14 to keep all smell receptors working all the time but can 15 new receptors if necessary.This may 16 explain why we are not usually sensitive to our own smells we simply do not need to be.We are not 17 of the usual smell of our own house but we 18 new smells when we visit someone else's.The brain finds it best to keep smell receptors 19 for unfamiliar and emergency signals 20 the smell of smoke,which might indicate the danger of fire. 1.[A]although [B]as [C]but [D]while 2.[A]above [B]unlike [C]excluding [D]besides 3.[A]limited [B]committed [C]dedicated [D]confined 4.[A]catching [B]ignoring [C]missing [D]tracking 5.[A]anyway [B]though [C]instead [D]therefore 6.[A]even if [B]if only [C]only if [D]as if 7.[A]distinguishing [B]discovering [C]determining [D]detecting 8.[A]diluted [B]dissolved [C]determining [D]diffused 9.[A]when [B]since [C]for [D]whereas 10.[A]unusual [B]particular [C]unique [D]typical 11.[A]signs [B]stimuli [C]messages [D]impulses 12.[A]at first [B]at all [C]at large [D]at times 13.[A]subjected [B]left [C]drawn [D]exposed 14.[A]ineffective [B]incompetent [C]inefficient [D]insufficient 15.[A]introduce [B]summon [C]trigger [D]create 16.[A]still [B]also [C]otherwise [D]nevertheless 17.[A]sure [B]sick [C]aware [D]tired 18.[A]tolerate [B]repel [C]neglect [D]notice 19.[A]available [B]reliable [C]identifiable [D]suitable 20.[A]similar to [B]such as [C]along with [D]aside from

考研英语重点语法小归纳.doc

参考译文：如果这些问题得不到解决，研究行为的技术手段就会继续受到排斥，解决问题的唯一方式不能也随之继续受到排斥。分析：很明显，and with it possibly the only way to solve our problem，是一个省略句，with做状语一般表示伴随，这一个分句只有一个状语加一个名词结构，构不成一个完整的句子。实际上，与前句相同的成分才会被省略，前一句的谓语部分是：will continue to be rejected. 所以，后一分句补充完整就是：with the rejection of the technology of behavior, possibly the only way to solve our problem will continue to be rejected. 三、从句从句不能单独成句，但它也有主语部分和谓语部分，就像一个句子一样。所不同在于，从句须由一个关联词（connective）引导。根据引导从句为主不同大概可分为：主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句；而状语从句功能相当于副词，称为副词性从句。状语从句还可以分为条件状语从句、原因状语从句、地点状语从句和时间状语从句。在翻译的时候，它会成为一个考点，所在在做题的时候，一定要辨清它到底是什么从句，正确地翻译出来。

例如：Time was when biologists somewhat overworked the evidence that these creatures preserve the health of game by killing the physically weak,or that they prey only on“worthless”species.（2010，翻译）分析：本题中含有两个并列的同位语从句，that these creatures preserve the health of game by killing the physically weak, or that they prey only on“worthless”species.两个that的内容是对前面的evidence进行补充说明或解释。总之，这是在历年考研英语的基础之上总结的三个重点语法，它们重点中的重点，每年都会以一定的形式出现在考题中，希望广大考生引起足够重视，各个击破！中国大学网考研频道。参考译文：如果这些问题得不到解决，研究行为的技术手段就会继续受到排斥，解决问题的唯一方式不能也随之继续受到排斥。分析：很明显，and with it possibly the only way to solve our problem，是一个省略句，with做状语一般表示伴随，这一个分句只有一个状语加一个名词结构，构不成一个完整的句子。实际

考研英语词汇大全-必看

可编辑英语常用词组4249个(详细版) 薛建菠 A 1.a fraction of 一部分 2.a matter of concern 焦点 3.a series of 一系列, 一连串 4.abandon sb to sth （不顾责任、义务等）抛弃,离弃 5.abandon sth to sb 不得已而放弃辨析 abandon：迫于不得已而停止（支持，帮助）；放弃义务，信念，责任 stop：停止某行为 give up doing：放弃做某种行为 6.ability to do sth（注：不加of doing）有能力做某事 7.to the best of one’s ability 尽其所能辨析 ability：具备做某事的能力（用法：ability to do sth（注：不加of doing）） capability：具备做某事所需的能力或素质（用法：capability to do sth/也可加of doing）） 8.be able to do sth 能够辨析 able：强调通过努力而获得的能力（用法：be able to do sth） can：表示本身具有的一般能力 capable：（用法：capable of doing） 9.be about to do …when… 打算 10.abound with/in 富于、充满… 11.above all 近义词:especially 尤其是, 最重要的 12.be absent from 缺席 13.absence of mind 近义词:being absent-minded 心不在焉 14.absent oneself from sth 不在 15.absolve sb from 赦免某人… 16.be absorbed in 近义词:be engrossed in;be lost in;be rapt in;be concentrated on be focused on;be centered on 全神贯注于… 17.abstain from 避开(免)… 18.be abundant in 近义词:be rich in;be well supplied with 富于,富有 19.abundant in 富于 20.accept sth 同意某事 21.accept sb into sth/ accept sb as sth 接纳某人 22.accept that… 相信/认为… 23.access to (不可数名词) 能接近,进入辨析 accept：表示主观意愿 receive：表示客观事实（用法：receive sth from sb/sth） 24.by accident 偶然辨析 accident 通常指“不幸的”意外事故，如车祸，摔伤，砸伤等，多指无意或偶然造成的。精品文档

2015年考研英语(一)深度解析：完型

2015年考研英语（一）深度解析：完型 1. [A] what 【解析】此题考查疑问代词辨析：题干中过去分词短语published from the University of California and Yale University…作后置定语，修饰study，而真正的句子主干是That is 1 a study has 2 .简化后的句子可以让我们清晰地看出第一题要说的是研究study的具体内容是what，不是方式how，也不是原因why，更不是时间when。 2. [B] concluded 【解析】此题考查动词辨析：同第一题一样，根据简化的句子That is what a study has 2 来解题。题目选择的动词是说明study怎样才有了上面what表示的内容。所以此题选择concluded“推断;得出结论”。其他的动词据不符合要求。 3. [D] on 【解析】此题考查介词辨析：根据题干The study is a genome-wide analysis conducted 3 1932 unique subjects的要求，所选择的介词能用在conduct“实施;进行”之后，又得和subject 搭配，所以这个题目应该选择on，构成on some subjects“关于某类主题”。 4. [C] compared 【解析】此题考查动词辨析：通过观察题干，我们发现第4题位于which引导的定语从句之内，作从句的谓语动词。Which修饰主句的主语study“研究”，如此补全定语从句就是： The study 4 pairs of unrelated friends and unrelated strangers…所以正确答案选择C。该项研究是对比所选择的两个样本。其他选项都不符合题意。 5. [C] samples 【解析】此题考查名词辨析：The same people were used in both 5 .通过观察题干，我们发现第5题空前的单词是both，表示“两者都…”。而上文中提到两者的只有“unrelated friends”和“unrelated strangers”，即这项研究的两个样本，所以答案选择C. samples“样本”。 6.[A] insignificant 【解析】此题考查形容词辨析和让步关系：题干While 1% may seem 6 , it is not so to a geneticist句首的While引导让步状语从句，同时提示我们逗号后和逗号前的内容形成一定程度上的对立关系，而且作者的表达重点位于逗号之后，1%的数量对于基因研究者来说影响程度很大。那么对于普通人而言这个数据就显得微不足道了。正确答案只能选择A。 7. [C] know 【解析】此题考查动词辨析和转折关系：题干Most people do not even 7 their fourth cousins but somehow manage to select as friends the people who 8 our kin中说“大多数人甚至不他们的第四代表亲，但是尽量选择和亲属人作为朋友”。even“甚至”这一个词就提示我们应该本题只能选择know“了解，认识”，其他选项都不符合题目要求。 8. [D] resemble

历年考研英语语法完全版归纳

英语语法总结全集名词和主谓一致一、名词的分类英语中名词主要可以分为可数名词和不可数名词。 1．可数名词可数名词一般都有单复数。单数时，名词前可加不定冠词a/an；复数时，前面可加数词，名词本身要改成复数形式。可数名词的复数有规则和不规则两种变化。规则的名词，只要在单数名词之后加“s”，“es”或去“y”加“ies”就行，如：an umbrella, twelve umbrellas；a factory, three factories。不规则的名词变化则要靠积累记忆，如：a mouse, ten mice；a policeman, six policemen。有少数可数名词，如sheep，works（工厂），Chinese等，它们的单复数同形：a sheep, four sheep；a chemical works, five chemical works。此外，还有一些可数名词只有复数形式，如clothes，trousers，cattle，police，people(人，人民)等。英语名词中还有一些合成词，它们的复数形式有三种可能：1）后面的部分变成复数形式：grown-ups，boy students，grandchildren。2）前面的部分变成复数形式：passers-by，lookers-on，sons-in-law。3）前、后都变成复数形式：men doctors，women drivers。 2．不可数名词不可数名词没有单复数的变化，前面也不能加a/an，或数词。但是我们可以用量词来表示不可数名词的数量，单复数表现在量词上，如：a piece of paper；two pieces of paper。在有些情况下，不可数名词也可用a/an，表“一种”、“某种”的意思，如have a wonderful time，receive a good education，be made into a fine paper。有时为了表示量大，不可数名词的后面也可加“s”，如sands，ashes，waters等。但是我们在学习不可数名词的时候，特别要记住英语中有一些名词，它们无论在什么情况下，前面都不能用a/an，后面也不可加“s”，如weather，information，等。 3．有的名词既可是可数名词，也可是不可数名词英语中有相当一部分的名词，既可以是可数，也可以是不可数，它们的意义有时略有不同，有时则完全不同。如：difficulty, success, time, work，paper，glass，等。 4．用于表示可数与不可数名词的数量“多”“少”的常用词和词组跟可数名词连用的如：few, a few, many。跟不可数名词连用的如：little, a little, much。可数与不可数都能用的是：a lot of , plenty of。二、主谓一致 1．通常被看作单数的主语部分 1）不定式、动名词和主语从句。 eg.. To see is to believe. Seeing is believing. What he said was different from what he did. 2）表示“时间”“距离”“金钱数量”的名词。 eg. Twenty years is quite a long time. 10 kilometers doesn’t seem to be a long distance to Mira. 300 dollars is too much for this old coin. 3）数学式子。 eg. Two plus five is seven. 4）书报杂志、国家、单位的名字。 eg. The Times is published daily. The United States is a big country. 5）前面用a kind of, a sort of或this kind of, this sort of等词组的名词。 eg. This kind of tree(s) often grows well in warm weather. 6）代词either, neither作主语。

2018考研英语二高频词汇表

考研英语二高频词汇表选自英语二词汇《句句有词》 process过程；工序；程序vt. growth增加，增长(量)；生长，发展technology工艺，技术 theory理论，原理；学说；看法，见解economy经济(制度)，经济情况；节约，省俭behavio(u)r行为，举止；运转情况 account账(目)，账户；叙述，说明 economic经济(学)的，经济上的 individual单独的，个人的 product产品，产物；乘积 rate(比)率；速度，进度；价格，费用 create创造，创建，创作；引起，产生 decline下降，减少，衰退；婉拒 hard硬的，坚固的；烈性的；困难的 ability能力，本领；才能，才智

professional spot斑点，污点；地点；一点儿vt．认出，发现；玷污tend照管，护理 view眼界；风景；(常用pl．)看法vt．看待；观察advocate鼓吹(者)，拥护(者) amount数量vi．合计；等同 community团体，社会；界，族；社区;群落 concern关联；关心n. environment factor因素，要素 intelligence智力，智慧；情报 rape [reip] n.强奸；破坏，蹂躏 vt.强奸；破坏，蹂躏rash [r??] a.轻率的，鲁莽的 [反] deliberate n.皮疹 guideline [?ga?dla?n] n.指导方针，指导原则，准则，标准gut [ɡ?t] n.[pl.]胆量；内脏a.本能的vt.取出内脏 refund [?ri:f?nd] n.v. 退款；赔偿

考研英语完形填空

1986年全国硕士研究生入学统一考试英语试题 On Wednesday afternoons Annie took the bus into town to shop in the market. For an hour or __16__ she would walk up and down between the stalls looking at everything, buying here and there, and __17__ a sharp lookout for the bargains that were sometimes to be had. And then, with all the things she needed __18__ she would leave the market for the streets of the town to spend another hour __19__ she liked best: looking in furniture shop windows. One Wednesday she found a new shop full of the most delightful things, with a notice inviting anyone to walk in and look __20__ without feeling they had to buy something. Annie hesitated for a moment before stepping through the doorway where, almost at once, she stopped __21__ before a green armchair. There was a card on the chair which said: “This fine chair is yours __22__ less than a pound a week,” and very small at the bottom, “Cash price eighty-nine pounds fifty.” A pound a week... __23__, she could almost pay that out of her housekeeping money and never miss it! A voice at her shoulder made her __24__. “Can I help you, Madam?”She looked round at the assistant who had come softly to her __25__. “Oh, well, no,” she said. “I was just looking.”“We’ve chairs of all kinds in the showroom. If you’ll just come up, you will find something to suit you.” Annie, worried at the thought of being persuaded to buy something she didn’t need, left the shop hurriedly. 16. [A] so [B] more [C] else [D] another 17. [A] taking [B] making [C] fixing [D] keeping 18. [A] buy [B] bought [C] buying [D] to have bought 19. [A] in a way [B] by the way [C] in the way [D] on the way 20. [A] behind [B] round [C] back [D] on 21. [A] doubted [B] wondered [C] puzzled [D] delighted 22. [A] at [B] for [C] with [D] in 23. [A] Why [B] When [C] How [D] What 24. [A] jump [B] leap [C] laugh [D] wonder 25. [A] place [B] back [ C] side [D] front

考研英语语法总结

英语语法总结下文总结了十二个要点： 1、主谓一致 2、时态 3、语态 4、非谓语动词 5、情态动词 6、虚拟语气 7、句子种类 8、名词性从句 9、状语从句 10、定语从句 11、强调句 12、倒装句当然以上并不是全部要点，还有一些比较基础的，比如：祈使句、省略句、名词等知识点比较简单，在平时做题中自然而然就积累下来了，不需要刻意背诵。一、主谓一致主谓一致的关键在于，分条记清楚，不要混淆。 1、以动词不定式短语，动名词短语或从句作主语时，谓语动词一般用单数形式； To study English well is not easy.（动词不定式短语作主语） Reading in the sun is bad for your eyes. （动名词短语作主语） What he said is very important for us all. （从句作主语） 2、由连接词and或both…and连接起来的主语后面，要用复数形式的谓语动词。但若所连接的两个词是指同一个人或物时，它后面的谓语就用单数形式。 The writer and artist has come. 由and 连接的并列单数主语前如果分别有no, each, every 或more than a (an)/one,many a (an) 修饰时，其谓语动词要用单数形式。either, neither, each, every 或no+单数名词和由some, any no, every构成的复合不定代词，都作单数看待。 Every student and every teach is in the classroom. Many a boy and many a girl likes it. No boy and no girl likes it. Each of us has a new book. Is everyone here today? Somebody is speaking in class. Everything around us is matter 若none of 后面的名词是不可数名词，它的谓语动词就要用单数。若它后面的名词是复数，它的谓语动词用单数或复数都可以。 None of the sugar was left. None of us has (have) been to America. 3、在定语从句里，关系代词that, who, which 等作主语时，其谓语动词的数应与句中先行词的数一致。（画线为先行词） Those who want to go please write their names on the blackboard.

2019年考研英语词汇大全

2019 年考研英语词汇大全 2.about ['baut] ad.在周围;大约prep.关于;在周围a.准备 3.above ['bv] a.上述的ad.在上面,在前文prep.在..之上，高于 4.abroad ['br ：d] ad. 到国外，在国外 ; 在传播，在流传 5.abrupt ['brpt] a.突然的，出其不意的;(行为等)粗鲁无礼的 6. absence ['bsns] n.缺乏，不存有;缺席，不在场;缺席的时间 7.absent ['bsnt, b'sent] a.缺席的;缺乏的,不存有的;心不在焉的 8.absolute ['bslju：t] a.绝对的，完全的;确实的，肯定的 9. absorb [b's ：b, -'z ：b] vt. 吸收 ( 水、光、蒸汽等 ); 使全神贯注 ; 吞并/ 兼并 10.abolish ['bli] vt.废除(法律、习惯等);取消 11.adore ['d ：] "vt. 崇拜 , 敬慕 , 爱慕 ; 非常喜欢 " 12.adult "['dlt, 'dlt]" n.成年人a.成年的，充分长成的，成熟的 13.abdomen [b'dumen] n. 腹，下腹 ( 胸部到腿部的部分 ) 14. abatement ['beitmnt] n.减( 免) 税，打折扣，冲销 15. abide ['baid] vi.(abode，abided)(by)遵守 ;坚持 ;vt.忍受，容忍

16. ability ['biliti] n.水平;本领;才能，才干;专门技能，天资 17. adjective ['diktiv] n.形容词a.形容词的，用作形容词的 18.adjoin ['din] v.临近，靠近;贴近，毗连 19.aboard ['b ：d] ad.&prep. 在船 ( 飞机、车 ) 上;ad. 上船 ( 飞机、车 ) 20.abstract ['bstrkt] a.抽象的n.摘要,文摘,梗概vt.提取; 摘录要点 21. acceptance [k'septns] n.接受，接收，验收，接纳; 承认，认可 22.access ['kses] n.进入;接入;到达;享用权;入口vi.存取 23.accessory [k'sesri] "n. 附件 , 附属品 ;( 为全套衣服增加美感的) 服饰" 24.accident ['ksidnt] "n.意外遭遇,事故;意外(因素)" 25. accidental "[,ksi'dentl]" a.偶然的;意外的;无意中的 26. academy ['kdmi] n.(高等)专科院校;学术社团，协会，研究院 27. accelerate [k'selreit] v.使加速，使增速，促动vi.加快，增加 28. accent "['ksnt, k'sent]" "n.口音,腔调;重音(符号)vt. 重读 " 29. accept [k'sept] vt.接受，领受;认可，同意vi.同意，认可

考研英语词汇大全--必看

英语常用词组4249 个 ( 详细版 ) 薛建菠 A 1.a fraction of一部分 2.a matter of concern焦点 3.a series of一系列,一连串 4.abandon sb to sth（不顾责任、义务等）抛弃, 离弃 5.abandon sth to sb不得已而放弃辨析 abandon：迫于不得已而停止（支持，帮助）；放弃义务，信念，责任 stop ：停止某行为 give up doing ：放弃做某种行为 6.ability to do sth（注：不加 of doing）有能力做某事 7.to the best of one’s ability尽其所能辨析 ability ：具备做某事的能力（用法： ability to do sth （注：不加 of doing） capability：具备做某事所需的能力或素质（用法：capability to do sth/ 也可加 of doing） 8.be able to do sth能够辨析 able ：强调通过努力而获得的能力（用法：be able to do sth） can：表示本身具有的一般能力 capable ：（用法： capable of doing ） 9.be about to do,when,打算 10.abound with/in富于、充满, 11.above all近义词:especially尤其是,最重要的 12.be absent from缺席 13.absence of mind近义词:being absent-minded心不在焉 14.absent oneself from sth不在 15.absolve sb from赦免某人, 16.be absorbed in近义词:be engrossed in;be lost in;be rapt in;be concentrated on be focused on;be centered on全神贯注于,

历年考研英语完形填空真题

历年考研英语完形填空真题（2005） The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, 1 this is largely because, 2 animals ,we stand upright. This means that our noses are 3 to perceiving those smells which float through the air, 4 the majority of smells which stick to surfaces. In fact 5 , we are extremely sensitive to smells, 6 we do not generally realize it. Our noses are capable of 7 human smells even when these are 8 to far below one part in one million. Strangely, some people find that they can smell one type of flower but not another, 9 others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate 10 smell receptors in the nose. These receptors are the cells which sense smells and send 11 to the brain. However, it has been found that even people insensitive to a certain smell 12 can suddenly become sensitive to it when 13 to it often enough. The explanation for insensitivity to smell seems to be that brain finds it 14 to keep all smell receptors working all the time but can 15 new receptors if necessary. This may 16 explain why we are not usually sensitive to our own smells we simply do not need to be. We are not 17 of the usual smell of our own house but we 18 new smells when we visit someone else's. The brain finds it best to keep smell receptors 19 for unfamiliar and emergency signals 20 the smell of smoke, which might indicate the danger of fire. 1. [A]although [B]as [C]but [D]while 2. [A]above [B]unlike [C]excluding [D]besides 3. [A]limited [B]committed [C]dedicated [D]confined ￥ 4. [A]catching [B]ignoring [C]missing [D]tracking 5. [A]anyway [B]though [C]instead [D]therefore 6. [A]even if [B]if only [C]only if [D]as if 7. [A]distinguishing[B]discovering [C]determining[D]detecting 8. [A]diluted [B]dissolved [C]determining[D]diffused 9. [A]when [B]since [C]for [D]whereas 10. [A]unusual [B]particular [C]unique [D]typical 11. [A]signs [B]stimuli [C]messages [D]impulses （ 12. [A]at first [B]at all [C]at large [D]at times 13. [A]subjected [B]left [C]drawn [D]exposed 14. [A]ineffective [B]incompetent [C]inefficient[D]insufficient 15. [A]introduce [B]summon [C]trigger [D]create 16. [A]still [B]also [C]otherwise [D]nevertheless 17. [A]sure [B]sick [C]aware [D]tired 18. [A]tolerate [B]repel [C]neglect [D]notice 19. [A]availabe [B]reliable[C]identifiable[D]suitable 。 20. [A]similar to[B]such as [C]along with [D]aside from