首页
登录
职称英语
The human nose is an underrated tool. Humans are often thought to be insensi
The human nose is an underrated tool. Humans are often thought to be insensi
游客
2024-04-23
12
管理
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 [br] 【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://tihaiku.com/zcyy/3567839.html
相关试题推荐
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensi
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensi
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensi
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumans
随机试题
Thesedays,peoplewhodo【C1】______workoftenreceivefarmoremoneythanpe
PatentPatents【T1】______thechancesofinventorstomakemoneyfrom【T2】_
砖砌体砌筑方法,下列哪项是不正确的?( )A.砖砌体采用上下错缝,内外搭接
某企业组网方案如图1-1所示,网络接口规划如表1-1所示。公司内部员工和外部访客
心律失常的治疗组合中,下列错误的是A.频发多源性室性期前收缩成对出现或RonT-
A.生地黄,黄连B.熟地黄,知母C.桃仁,薏苡仁D.秦皮,黄柏E.黄芩,芍药属于
瓶装溶液高压蒸汽灭菌的正确操作是A.瓶子密封完好 B.瓶塞应插入针头通气 C
如图所示的车辆,可称为拖修车、清障车或交通事故牵引车,使用的是柴油发动机
某小型化工厂每年需消耗某种原材料1600吨,每吨原材料的价格为40000元,单位
高血压病的治疗原则
最新回复
(
0
)