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
Much ink has been spilled on the question of human hairlessness: why, as Desmond Morris put it in the title of a book published
Much ink has been spilled on the question of human hairlessness: why, as Desmond Morris put it in the title of a book published
admin
2013-12-04
44
问题
Much ink has been spilled on the question of human hairlessness: why, as Desmond Morris put it in the title of a book published in 1967, humankind is "The Naked Ape." Less attention has been paid, though, to the fact that humans are not really hairless at all. Per square centimeter human skin has as many hair follicles(毛囊)as that of other great apes. The difference is in the fineness of the hair. These fine human hairs do not seem to perform any of the functions of their counterparts in more hairy species(insulation and signaling). So what are they for?
That is a question addressed by Isabelle Dean and Michael Siva-Jothy of Sheffield University, in Britain, who took tremendous persuasion and effort to recruit 29 volunteers—19 men and 10 women. Each had a patch of skin on one arm shaved, marked with a pen and surrounded by petroleum jelly, and a patch of the same size on the other marked and surrounded, but not shaved. The bugs had been fed a week and then starved, so they were eager to eat. Volunteers were asked to look away while a researcher put a bug on one of the skin patches. The volunteer was then supposed to record, using a press-button counter, the number of times he perceived the insect moving on his skin.
The difference was significant. When the bug was on a hairy patch it was detected, on average, every four seconds. When it was on a shaved patch, more than ten seconds elapsed between detections. Moreover, the bugs seemed to find it harder to locate a good spot to bite when they were surrounded by hair. Though no volunteer was actually bitten, because the vigilance of the watching researcher meant the insects were removed when they were ready for biting, bugs on hairy skin took about a fifth longer than those on shaved skin to attempt to bite their hosts.
In both cases men were better off than women when the bugs were released on unshaven patches of skin, though there was no significant difference between the sexes when they were shaved. The conclusion is that one reason human body hair has not disappeared completely is to warn and protect us from the attention of hostile insects.
Paragraph 2 focuses on the experiment’s______.
选项
A、requirements
B、procedure
C、feasibility
D、rationale
答案
B
解析
第二段描述了迪恩女士和西瓦一乔西博士的实验是如何实施的,即实验过程。受试者的一只手臂上被剃光一块皮肤,用笔圈上并抹上一圈矿脂(把床虱拦在圈内),而另一只手臂上也划出同样大小的一块皮肤,同样抹上矿脂,但不剃掉体毛。床虱被禁食一周,因此急于进食。研究人员要求志愿者不要看放在他们手臂上的床虱。实验过程中志愿者要用一个按键式计数器记录他能够察觉到的虫子在皮肤上移动的次数。
转载请注明原文地址:https://kaotiyun.com/show/UhHO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Personalityistoalargeextentinherent—A-typeparentsusuallybringaboutA-typeoffspring.Buttheenvironmentmustalsoh
Inthisage,educationisconsideredanimportantkeytosuccessandminoritygroupsespeciallyare______tobetterthemselvesb
Althoughspeechandwritingarethespecialmeansofcommunicatingofhumans,theinterchangealsotakesplaceinmanyotherway
Today’sworkerisnolongerwillingtoworkinanauthoritariananddehumanizingenvironment.Workerswantmeaningintheirwork
Severalhundredmillionyearsago,plantssimilartomodernfernscoveredvaststretchesoftheland.Somewereaslargeastree
Bothversionsofthemyth—theWestasaplaceofescapefromsocietyandtheWestasastageonwhichthemoralconflictsconf
Nocompanylikestobetolditiscontributingtothemoraldeclineofanation."Isthiswhatyouintendedtoaccomplishwithy
Inmoderndays,onthewesternbankoftheupperTigrisRiverstandsanIraqicitycalledQal’atSherqat.Thousandsofyearsago
______thattheymayeventuallyreducetheamountoflabourneededonconstructionsitesby90percent.
Whoeverhasskillsandknowledgeinthiscountry,Ibelieve,shouldbeproperlytreatedandrewarded______hiseducationalbackgr
随机试题
护士在对患者留置套管针部位进行护理时,下列哪项措施不正确
100Hz纯听阈声压为
A、风池、太冲、合谷、内关、后溪B、风池、百会、悬颅、侠溪、行间C、上星、头维、合谷、阿是穴D、百会、通天、行间、阿是穴E、率谷、太阳、侠溪、内庭治疗前头痛风邪袭络证,应首选
某蓄电池厂男职工,工龄10年,主诉头晕、头痛、乏力、记忆力减退、睡眠障碍、纳差,脐周隐痛。经检验尿δ-ALA为28.6μmol/L治疗首选的药物是
犯罪嫌疑人闫某涉嫌故意杀人罪,一审被市中级人民法院判处死刑缓期二年执行。判决宣告后,闫某没有提起上诉,市人民检察院也没有抗诉,市中级人民法院依法提起死刑复核程序,下列哪些选项的说法是错误的?
雨季,对石灰、电石等常用的遇水燃烧物品应采取()措施。
采暖系统设置时,以下哪种说法是错误的?(2007,74)
会计软件是以()为依据。
导游人员的年审以考评为主,下列属于考评内容的包括()。
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’snowa"globalvillage"wherecountriesareonlyseco
最新回复
(
0
)