时间:2018-11-30 作者:英语课 分类:历年考研英语完型填空


英语课
[00:00.00]在线英语听力室(www.tingroom.com)友情制作
[00:03.12]2005
[00:06.89]The human nose is an underrated tool.
[00:09.60]Humans are often thought to be insensitive smellers
[00:12.53]compared with animals,
[00:14.04](1)but this is largely because, (2)unlike animals,
[00:16.97]we stand upright.
[00:18.69]This means that our noses are (3)limited to
[00:20.81]perceiving those smells which float through the air,
[00:24.03](4)missing the majority of smells
[00:25.54]which stick to surfaces.
[00:27.66]In fact, (5)though, we are extremely sensitive to smells,
[00:31.59](6)even if we do not generally realize it.
[00:34.42]Our noses are capable of (7)detecting human smells
[00:37.44]even when these are (8)diluted to far below
[00:40.06]one part in one million.
[00:42.68]Strangely, some people find that they can smell
[00:45.71]one type of flower but not another,
[00:47.72](9)whereas others are sensitive
[00:49.14]to the smells of both flowers.
[00:51.35]This may be because some people do not have
[00:53.46]the genes 1 necessary to generate 2 (10)particular smell receptors
[00:57.12]in the nose.
[00:58.00]These receptors are the cells which sense smells
[01:01.19]and send (11)messages to the brain.
[01:03.61]However, it has been found
[01:05.22]that even people insensitive to
[01:06.84]a certain smell (12)at first
[01:08.66]can suddenly become sensitive to it
[01:10.47]when (13)exposed to it often enough.
[01:12.30]在线英语听力室(www.tingroom.com)友情制作
[01:13.30]The explanation for insensitivity to smell
[01:16.01]seems to be that the brain finds it
[01:17.93](14)inefficient to keep all smell receptors working all the time
[01:21.77]but can (15)create new receptors if necessary.
[01:24.50]This may (16)also explain
[01:25.91]why we are not usually sensitive to our own smells
[01:29.14]--we simply do not need to be.
[01:30.96]We are not (17)aware of the usual smell
[01:33.11]of our own house,
[01:34.52]but we (18)notice new smells
[01:35.93]when we visit someone else's.
[01:37.84]The brain finds it best to
[01:39.37]keep smell receptors (19)available for unfamiliar
[01:42.09]and emergency signals
[01:43.71](20)such as the smell of smoke,
[01:45.11]which might indicate the danger of fire.


1 genes
n.基因( gene的名词复数 )
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
2 generate
vt.生成,产生(光、热、电等)导致
  • We need someone to generate new ideas.我们需要有人出新主意。
  • This book will continue to generate excitement for a long time.这本书将在很长一段时间里继续使人们为之激动。
学英语单词
advance naval base
afternoon session
angioelephantiasis
annuity method of depreciation
austronesias
averpennies
axhandles
benzyl mercuric chloride
Bezymyannoye
bezzy
boll shedding
bothidaes
brightness intelligence
brodown showdown
Calaburne
capital from consolidation
choriocarinoma of testis
coarb
corectomy
corn mayweeds
counter-terrorisms
curvefit
deflicted
dimedon
education and dance
excarnificated
fairlee
flash at
flue gas and fire monitor
foldaways
Forsytes, the
geographical plot
glicken
glucosaccharase
goods out on consignment
gray cataract
greenstripe common bamboo
gross trade turnover
guided missile target
handlead survey
high-melting metal
Holmesian
humane killing
hydrogen/oxygen rocket engine
IHSC
interface builder
jig drill
kastrosykia (kastrosikia)
klofas
large-angle
like to hear oneself talk
lime sinter process
loudspeaker placement
Lumbricus
macomb
mantle bacteria
mascoll
material orientation
mincement
mispraising
NADA daiquiri
operate under capacity
output trunk
ozone depletion potential (odp)
Paranhos
phenyl ethyl cinnamate
platinum lop
prismatic powder
prochoanitic
propyl-acetic acid
quezaltenango
radiation content meter
radio weather forecasts
reading achievement
resinol
royt
S-26
Salumbwe
Sarandapali
selenium (se)
semi finished screw
serous inflammation
simple array assignment statement
single-phasing protective mechanism
soil self-purification function
Sonoma County
stage payment
steel calender
streaking technique
summer solstice
sweet gas
symbol of numeral
tadah
tallow wet-render
telewriter exchange service
transistored bridge
vietnam-style
water-birds
XVT
yaltas
zygnemas