首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is lar
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is lar
admin
2016-04-01
47
问题
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is largely because, unlike animals, we stand upright This means that our noses are【C1】______to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces. In fact, though, we are【C2】______sensitive to smells, even if we do not generally realize it. Our noses are capable of【C3】______human smells even when these are diluted to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another, whereas others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate【C4】______smell receptors in the nose. These receptors are the cells which sense smells and send【C5】______to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when【C6】______to it often enough.
The explanation for insensitivity to smell seems to be that the brain finds it【C7】______to keep all smell receptors working all the time but can create new receptors if necessary. This may also explain why we are not usually sensitive to our own smells—we【C8】______do not need to be. We are not【C9】______of the usual smell of our own house, but we notice new smells when we visit someone else’s. The brain finds it best to keep smell receptors available for unfamiliar and【C10】______signals such as the smell of smoke, which might indicate the danger of fire.
A)simply B)emergency C)aware D)detecting
E)permanently F)limited G)sure H)inefficient
I)dedicated J)exposed K)impulses L)messages
M)distinguishing N)particular O)extremely
【C1】
选项
答案
F
解析
根据空格前的系动词are,可知这里应填入名词、形容词或分词。上文提到人类嗅觉不灵敏是由于人类直立行走,本句进一步解释说明这种现象导致的结果,即人直立行走,所以人的鼻子只能感知通过空气流通而散发的气味。词库中limited、dedicated和exposed在语法上都可行,但只有limited在意思上符合句意,表明人类鼻子的“局限性”。
转载请注明原文地址:https://kaotiyun.com/show/byL7777K
0
大学英语六级
相关试题推荐
AustraliahasbeenunusualintheWesternworldinhavingaveryconservativeattitudetonaturaloralternativetherapies,acco
Moreandmoregadgetsseektoreplicatethesortsofthingsyourmotherusedtoneedleyouabout:gettingexercise,eatingmore
Everybodyloathesit,buteverybodydoesit.Arecentpollshowedthat40%ofAmericans【C1】______thepractice.InAmericaalone,
Iamoneofthemanycitypeoplewhoarealwayssayingthatgiventhechoiceweshouldprefertoliveinthecountryawayfromt
ThemoleculesofcarbondioxideintheEarth’satmosphereaffecttheheatbalanceoftheEarthbyactingasaone-wayscreen.A
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpeople?AccordingtoarecentstudybytheNationa
Drone—ProblemandChancesA)InthefirstincidentonMay29,thepilotofacommercialairlinerdescendingtowardLaGuardiaAirp
WhenErikRobertson,anaccountexecutiveataSanFranciscopublicrelationsagency,meetswithconservativeclients,he’salw
A、DevelopmentoftheNationalFlagB、PoweroftheNationalFlagC、TypesofFlagsD、UsesofFlagsA短文主要介绍了国旗在古代的发展,故答案为A)。
A、Themeetingisnotonhisschedule.B、Hedoesn’tmindpostponingthemeeting.C、Themeetinggoesagainsthisschedule.D、Hedo
随机试题
按照《ISO/IEC软件生存周期过程12207—1995》中,可归于组织过程的是()
个人独资企业不具有法人资格,也无独立承担民事责任的能力,但却是独立的民事主体,可以自己的名义从事民事活动。()
悬浮少白细胞红细胞(400ml全血制备)用于预防非溶血性发热输血反应时,残余白细胞量应为
防渗体部位的坝基、岸坡岩面开挖,应采用(),使开挖面基本上平顺。
下列指标中,取值越大说明项目效益越好的是()。
在实际设备更新方案比选时,应遵循的原则不包括()。
社会上有两种现象:一是读书无用论抬头,某地区很多考生放弃高考;另一种是大学生毕业后,选择重新进入技校学习技能。谈谈你的看法。
邓小平理论的科学体系主要包含
Rerunsofsituationcomediesfromthefiftiesandearlysixtiesdramatizethekindsofproblemsthatparentsusedtohavewitht
FiveMainLiteraryMovementsinAmericanHistoryI.Transcendentalism—bornin【B1】______:thenortheasternpartoftheUS【B1】_
最新回复
(
0
)