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
2017-12-07
35
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 E) permanently I) dedicated M) distinguishing
B) emergency F) limited J) exposed N) particular
C) aware G) sure K) impulses 0) extremely
D) detecting H) inefficient L) messages
【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://jikaoti.com/ti/GRNFFFFM
0
大学英语六级
相关试题推荐
Forthispart,youareallowed30minutestowritealetterofsuggestiontotheuniversityPresident.Youshouldwriteatleast
Forthispart,youareallowed30minutestowriteashortessayentitledOnFlashMarriage.Youshouldwriteatleast150words
Drought,tsunami,violentcrime,financialmeltdown—theworldisfullofrisks.Thepoorareoftenmost【C1】______totheireffect
Peoplecannowavoidhavingtosortthroughalbumsfromseveraldifferentfriendswhentryingtoreliveparties,weddingsandot
A、ThelawsontaxisinLondon.B、ThelifeofJack,ataxidriverinLondon.C、HowtobeataxidriverinLondon.D、Body-building
A、Forscientificstudy.B、Forfieldguides.C、Forentertainment.D、Forsomefilmbackground.C细节题。本题的关键点在于注意题目中的“not”。原文中提到记录动物声
Learningisanessentialprocessforlivingthingstoacquirenecessaryskillsandbehaviors.Scientistshavealreadyfoundthat
A、Theydryinashorttime.B、Theyareeasytofindinstores.C、Theycomeinmanyunusualcolors.D、Theyfeelpleasanttothet
A、Makingasummaryofthosejobs.B、Avoidingthewrongrecords.C、Introducingeverythingofthosejobs.D、Emphasizingthesalary
A、Theymaynotshowthestudents’masteryofalltheknowledge.B、Theymaygiverisetounhealthycompetition.C、Theymaymakes
随机试题
在胎儿股骨超声测量中,下列哪种伪像是要注意的
可用来解救链激酶过量引起的出血的药物是
A.女孩8岁前有性发育B.多尿、低比重尿、烦渴、多饮C.闭经不育或溢乳D.青春期前生长激素分泌过多E.躯体发育迟缓,身材矮小性早熟症()
参演人员所承担的具体任务主要包括()。
不属于集中布局空间形态模式的是()
属于试探性的多元化经营的开始和策略性投资的资产重组方式是()。
假设甲将“小姐”乙某从歌厅诱出后,劫持并逼迫乙某带领甲到乙某居住处,洗劫财物。另将乙某扣押至第二日银行开门营业时,挟持乙某到银行取出存款方才罢休。则甲的行为应当如何定罪处罚?()
下列关于外部排序说法正确的是()。
联系实际。试述对教师专业素质的基本要求。
法与原始习惯的区别是什么?
最新回复
(
0
)