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
50
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、when
B、since
C、for
D、whereas
答案
D
解析
此处空格前后的两个分句some people find that..., ______ others are..., 显然构成一种对比关系,只有whereas能用于引导表示转折关系的并列句,故D项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3192964.html
相关试题推荐
Heisnot______Ithoughthewouldbe.A、moreahelpthanB、ahelpmorethanC、s
Wethoughtthechairwasanantiqueworthalotofmoney,butitturnedouttob
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
Paintinghasbeencontinuouslypracticedbyhumansforsome20,000years.T
随机试题
HowtoapproachReadingTestPartFive•ThispartoftheReadingTesttestsyou
"FamineThreatensMillions!"Headlinessuchasthisareunhappilyfrequent.
每月应对气压水罐的压力和有效容积等进行一次检测。
临床判断消化道出血完全停止的最可靠实验指标结果是A.粪镜检无红细胞 B.粪胆素
患者男性,75岁,突发意识丧失证实心脏骤停可根据 A.血压下降 B.瞳孔散大
阿桑是一位藏族学生,按照家里的民族风俗,阿桑每天早上要在屋内点上藏香,同寝室的汉
天王补心丹主治证是A.气虚血少,神志不安证 B.阴阳两虚,神志不安证 C.阳
在盐酸及氢氧化钠溶液中均易溶解的药物是A.氯霉素 B.诺氟沙星 C.乙胺丁醇
3月1日,甲公司将一台设备出售给乙公司,同日,乙公司以该设备抵押给甲公司担
表示资料频数分布可用A.普通线图 B.直方图 C.条图 D.百分比构成图
最新回复
(
0
)