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
2023-11-16
33
管理
问题
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals,【31】this is largely because,【32】animals, we stand upright. This means that our noses are【33】to perceiving those smells which float through the air,【34】the majority of smells which stick to surfaces. In fact,【35】, we are extremely sensitive to smells,【36】we do not generally realize it. Our noses are capable of【37】human smells even when these are【38】to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another,【39】others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate【40】smell receptors in the nose. These receptors are the cells which sense smells and send【41】to the brain. However, it has been found that even people insensitive to a certain smell【42】can suddenly become sensitive to it when【43】to it often enough.
The explanation for insensitivity to smell seems to be that the brain finds it【44】to keep all smell receptors working all the time but can【45】new receptors if necessary. This may【46】explain why we are not usually sensitive to our own smells—we simply do not need to be. We are not【47】of the usual smell of our own house, but we【48】new smells when we visit someone else’s. The brain finds it best to keep smell receptors【49】for unfamiliar and emergency signals【50】the smell of smoke, which might indicate the danger of fire. [br]
选项
A、at first
B、at all
C、at large
D、at times
答案
A
解析
本题描述的是人们的嗅觉对某种气味从不敏感到敏感的变化过程。用A项at first来说明“起先”不敏感,符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3192967.html
相关试题推荐
Accordingtothenarrator,whichkindofdogsisthoughttohaveasenseofhumo
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
Humansareuniqueintheextenttowhichtheycanreflectonthemselvesand
随机试题
Knowinghowtoconnecttwoseparatesentencesisquite(help)______foryourwrit
[originaltext]VoiceOne:OnehundredmilesofftheCaliforniacoast,anunderse
第一个人说:活得太累了。没完没了的解释,无休无止的小心,成年累月为别人活着。为人子、为人夫、为人父、为人同事、为人哥儿们、为人“喽喽”、为人“头头”。看别人
某公司承接了一个软件外包项目,项目内容包括A、B两个模块的开发测试,项目经理创建
证券投资咨询业务的基本形式包括()。 Ⅰ.证券投资顾问 Ⅱ.委托理财 Ⅰ
下列说法错误的是A.心开窍于舌B.肺开窍于二阴C.脾开窍于口D.肝开窍于目E.肾
患者,男,65岁。心脏瓣膜置换术后并发急性呼吸窘迫综合征。需使用呼吸机治疗。患者
关于痛经下述哪项不正确A.原发性痛经生殖器官无器质性病变 B.继发性痛经生殖器
()是企业中最基本的协作关系和协作形式。A:作业组 B:管理组 C:
资本主义再生产的特征是扩大再生产.这是由( ) A.资本有机构成提高决定的
最新回复
(
0
)