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,【31】this is larg
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals,【31】this is larg
admin
2012-01-05
14
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.
选项
A、introduce
B、summon
C、trigger
D、create
答案
D
解析
new receptors本来是没有的(所以对某些花香不敏感),经与刺激物经常接触而产生,从而可以清晰感受到这些刺激。这是从无到有的过程,D项create最合适。
转载请注明原文地址:https://kaotiyun.com/show/KK1K777K
0
专业英语四级
相关试题推荐
WhichofthefollowingisNOTthereasonthatLisathinksRiceisqualifiedfortheposition?
Whatdidthemandoduringthewintervocation?
The______betweenGreeceandTroylastedtenyears,bringingseriousdisasterstothepeopleoftwonations.
Thenewsismainlyabout_______.
TheChinesespaceprogramaimsat______.
WhatdidmostEuropeanscholarsbelievebefore17thcenturyaboutthesizeoftheuniverse?
Accordingtothenews,howmanypilotwhaleseventuallydiedbeforetheywererescued?
Scientistssaythatmanyfactors______greatchangesintheweather.
Hiswealthenabledhimto______hispassionateinterestinart.
AccordingtonewresearchreleasedthisweekfromMiller-Williams,e-commercecustomersfeelthatover80percentoftheirdecis
随机试题
下列机关中,有权行使侦查权的是
冠桩的长度要求是
哪项不是卵巢肿瘤并发症
关于法官任职,下列选项中符合法律规定的是哪一项?()
根据马斯洛需求层次理论。A的口头禅反映了A的()。根据弗罗姆的期望理论,A为了实现儿时的理想,强烈要求去突尼斯销售分公司,说明()。
企业信用广义上是指企业遵守工商、税务、海关、劳动、环保等部门的有关法规,履行商业合同,偿还或有负债等方面的情况;狭义上是指企业对到期债务按期还本付息的能力和意愿。根据上述定义,下列属于狭义企业信用的是()。
在多元回归中,回归平方和是指()。
邓小平说:“美好的前景如果没有切实的措施和工作去实现它,就有成为空话的危险。”这一论断表明
Afindinginrecentyearsshowsthatmencannotmanufacturebloodasefficientlyaswomencan.Thismakessurgeryriskierforme
Whatkindoffamiliescanbepossiblychosenashome-stayfamilies?
最新回复
(
0
)