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
2019-09-18
25
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 O)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://kaotiyun.com/show/bNW7777K
0
大学英语六级
相关试题推荐
Forthispart,youareallowed30minutestowriteanessayonfabricatingacademiccredentials.Youressayshouldfocusonthe
A、Askherparentstopayforthetrip.B、Discusstheplanwithherparents.C、Dosomepart-timejobsduringthevocation.D、Stay
A、Theusers’commentonmedicineisnotalwaysreliable.B、Adsofover-the-counterproductsarenotallowed.C、Theclaimofany
Throughoutevolution,humanshavebeenactive.Ourancestorschasedpreyashunter-gatherersand【C1】______frompredators.Morer
A、Itisatraitofagenerouscharacter.B、Itisareflectionofself-esteem.C、Itisanindicatorofhighintelligence.D、Itis
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveitisthrougheducation.Negroes(黑人)shouldknowabout
Itishardlynecessaryformetocitealltheevidenceofthedepressingstateofliteracy.ThesefiguresfromtheDepartmentof
Theestimatesofthenumbersofhome-schooledchildrenvarywidely.TheU.S.DepartmentofEducationestimatesthereare250,00
A、Shefoundherfirstjobworkingwithacomputer.B、Shelostherjobowingtotheuseofcomputers.C、Shewaselectric-shocked
A、Finances,timeandproperty.B、Tuition,spendingandrelationships.C、Money,safetyandtimelimitations.D、Experience,spendi
随机试题
患者,男,37岁。反复左眼红及眼球后部疼痛1年。曾按“结膜炎”给予抗生素滴眼液滴眼,症状无明显缓解,眼球转动时和夜间明显,伴头痛、恶心及复视。眼部检查:右眼视力1.5,左眼视力0.8,矫正视力1.5;左眼睑充血肿胀,结膜充血水肿;眼前节正常。眼底(-)
A.“P”切迹B.颧突C.腭小凹D.颊侧翼缘区E.远中颊角区下颌舌骨嵴前方,口底上升时的最高点
老年患者,女,近3个月来右颈部淋巴结肿大,如蚕豆大小。其可能性最小的病变是
质量为m的两小球带等量同号电荷q,现用长为l的细线悬挂于空中O点,如图7-1所示,当小球平衡时,测得它们之间的水平距离为x,此时绳子的张力为()。
机器设备的修理复杂系数主要由()等因素决定。
根据资源税法律制度的规定,下列各项中,不属于资源税征税范围的是()。
根据以下资料,回答126~130题。关于2013年4月该市放广播影视情况,能够从资料中推出的是:
互相尊重和主权领土完整
AguaranteeisdefinedintheStatuteofFrauds1677as"awrittenpromisemadebyonepersontobecollaterallyanswerablefor
Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn".Peopleareinvite
最新回复
(
0
)