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
2016-12-18
53
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/5JF7777K
0
大学英语六级
相关试题推荐
IntheBritishMuseumonaSundayafternoon,ancientfaceslookbackatchildrenandadultsalike.Insidetheirglasscases,pha
IntheBritishMuseumonaSundayafternoon,ancientfaceslookbackatchildrenandadultsalike.Insidetheirglasscases,pha
HowCustomsWork[A]Oneofthelittleritualsallinternationaltravelersgothroughiscustoms.Tomostpeople,thisisjustan
Todaynanotechnology(纳米技术)isstillinaformativephase.Yetitismaturingrapidly.Between1997and2005,investmentinnanote
Thefirststeptodefeatinganenemyistopindownhisexactidentityandhowheoperates.Hypertension—chronic,abnormallyrai
Extinctionisdifficultconcepttograsp.Itisan【B1】______concept.It’snotatalllikethekillingofindividuallifeformsth
微博(microblog)是近几年开始兴起的一种社交网络服务。简单地说,就是将不超过140个字的几句话或者图片,通过电脑或手机发到微博上,随时随地和朋友分享你生活中的所见、所闻和所想。作为一种交际工具和获取信息的平台,这种新型的交流方式在不同年龄段的人群中
RisingInequalityIsHoldingBacktheU.S.Economy[A]Inannouncinghisrunforthepresidencylastmonth,JebBushhassetan
A、Humansshouldstopdamagingtheenvironment.B、Theearthwillnotbesuitableforhumans.C、Theweatherreportseemstobemor
Picasso’sartwasnotjustapleasantdistraction.Theartistbelievedthatarthelpstopenetratefurtherintotheworldandin
随机试题
患者,男,36岁,皮肤瘙痒,出现边界清楚、大小不一的红斑,周围有炎性红晕。表面覆盖多层银白色鳞屑。鳞屑易于刮脱,刮净后有淡红发亮的半透明薄膜,刮破薄膜可见小出血点。诊为寻常型银屑病。关于该药的应用注意,说法错误的是
被告人李某涉嫌故意杀人罪,被省高级人民法院判处死刑立即执行,在报请最高人民法院复核的过程中,被告人李某的辩护律师胡某的哪项行为是不被允许的?()
女性,50岁,因腹痛、呕吐、停止排气排便就诊,尿量600m1入院。查体:血压100/70mmHg,皮肤干燥,眼球下陷,腹胀,肠鸣音亢进,白细胞12×109/L,血清钾3.7mmol/L,血清钠128mmol/L,血清氯101mmol/L。此患者存在的水
患者男性,27岁,因突然发作性全身抽搐,口吐白沫,大小便失禁入院。既往有癫痫病史。针对患者进行健康教育指导,叙述错误的是()
()是在欧洲大陆和美国广泛实行的建设监理机构。
在重置抽样条件下,若抽样单位数是原来的16/9,其他条件不变,则抽样平均误差将( )。
下列歌剧角色中,属于女高音的角色是()。
某学生勾结社会青年在学校内结伙斗殴,扰乱教育教学秩序,按照我国《教育法》的规定,应该由()来处罚。
在深度为6的满二叉树中,度为2的结点个数为____________。
LastAugustSusanand42otherstudentsgotwetanddirtywhile(36)______6tonsofgarbagefromtheriverrunningacrosstheir
最新回复
(
0
)