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
A、The relation between hair and skin. B、The growing interest in skin studies. C、The color of human skin. D、The need of skin prot
A、The relation between hair and skin. B、The growing interest in skin studies. C、The color of human skin. D、The need of skin prot
admin
2021-01-08
30
问题
Skin may seem like a superficial human attribute, but it’s the first thing we notice about anyone we meet. As a zoologist focusing on the studies of apes and monkeys, I’ve been studying why humans evolved to become the naked ape, and why skin comes in so many different shades around the world. We can make a very good estimate from the fossil record that humans probably evolved naked skin around 1.5 million years ago, and meanwhile they mostly lost their coat of fur.
Today we have a few patches of hair remaining on various parts of our bodies. But compared with apes and monkeys, we have very little. Basically, we turned our skin darker to serve as a natural sun protector in the place of the hair we lost. We think we lost this hair because of the need to keep ourselves cool when we were moving around vigorously in a hot environment. We can’t really lose heat by breathing quickly and loudly like dogs. We have to do it by sweating. So we evolved the ability to sweat plentifully and lost most of our fur. Most animals protect themselves from the sun with fur. What we did in our ancestry was to produce more permanent natural coloring in our skin cells. This was really an important revolution in human history because it allowed us to continue to evolve in equatorial environments. It really made it possible for us to continue along the path toward modern humans in Africa.
For most of human history, we all had dark skin. What we see today is the product of evolutionary events resulting from the dispersal of a few human populations out of Africa around 60,000 to 70,000 years ago. Our species originated around 200,000 years ago and underwent tremendous diversification— culturally, technologically, linguistically, artistically— for 130,000 years. After that, a few small populations left Africa to populate the rest of the world. These early ancestors of modern Eurasians dispersed into parts of the world that had more seasonal sunshine and much lower levels of sun radiation. It’s in these populations that we begin to see real changes in the genetic makeup of natural coloring.
Today, skin color is evolving in the new mixtures of people coming together and having children with new mixtures of skin color genes. We can see this in almost every large city worldwide. Not only the coloring genes but lots of other genes are getting mixed up, too.
Questions 22 to 25 are based on the recording you have just heard.
22. What does the speaker mainly talk about?
23. What had probably caused humans to lose most of their hair 1.5 million years ago?
24. What does the speaker say protected early humans from the sun?
25. What happened after humans migrated from Africa to other parts of the world?
选项
A、The relation between hair and skin.
B、The growing interest in skin studies.
C、The color of human skin.
D、The need of skin protection.
答案
C
解析
讲座开头提到,皮肤是人体的一个属性,讲话者一直在研究为什么人类进化成裸猿,以及为什么世界各地有这么多不同的肤色。接下来讲话者提到,由于人类缺少毛发,皮肤变成了深色,以此来作为天然的防晒屏障;在人类进化历史的大多数时间,人类的皮肤一直是深色的,但是随着人类迁徙到太阳辐射水平较低的地方,他们的皮肤颜色又发生了变化;最后讲话者提到,当今,不同肤色的人聚集在一起又进化出了新的混合肤色,由此来解释讲座开头提到的为什么世界各地有这么多不同的肤色。因此,本文大意为人类皮肤的颜色,答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/niP7777K
0
大学英语六级
相关试题推荐
Peopleatthelowerendoftheincomescaletakemorepleasureintheirrelationshipsandenjoycaringforandconnectingwitho
Peopleatthelowerendoftheincomescaletakemorepleasureintheirrelationshipsandenjoycaringforandconnectingwitho
A、Differentapproachestocopingwithstress.B、Variouscausesofserioushealthproblems.C、Therelationshipbetweenstressand
It’swellestablishedthatsmokingcigarettes,especiallylargequantitiesofthem,isbadforyourhealth.Butanewstudyshow
中国目前拥有世界上最大最快的高速铁路网。高铁列车的运行速度还将继续提升,更多的城市将修建高铁站。高铁大大缩短了人们出行的时间。相对飞机而言,高铁列车的突出优势在于准时,因为基本不受天气或交通管制的影响。高铁极大地改变了中国人的生活方式。如今,它已经成了很多
A、Youraudienceandwhattheyareinterestedin.B、Whatyouraudienceexpectyoutotalkabout.C、Youraudienceandwhatkindof
ThedirectraysofthesuntouchtheequatorandstrikenorthwardtowardtheTropicofCancer.IntheSouthernhemispherewinter
Reebokexecutivesdonotliketoheartheirstylishathleticshoescalled"footwearforyuppies(雅皮士,少壮高薪职业人士)".Theycontendtha
A、Itletsblindpeopleexperiencefamouspaintings.B、ItiscalledAccesstoMuseumsforBlindandVisuallyImpairedpeople.C、I
UsingFacebookmakespeoplesadder,atleastaccordingtosomeresearch.Butjustwhatisitaboutthesocialnetworkthattakes
随机试题
在胀、焊同时选用的工艺中,采用先焊后胀比较合适。
脑脊液检查提示蛋白—细胞分离,通常是下列哪种疾病的特点()
A.卡比多巴B.氟哌啶醇C.苄丝肼D.硫必利E.安坦(苯海索)在临床上,出现氯丙嗪引起的急性运动障碍时,可采用的解救药为
涎腺造影检查的禁忌证为
目前我国房地产开发投资企业的营业税的税率为10%,城市维护建设税和教育费附加,是依托营业税征收的一种税费,分别为营业税税额的14%(市区)和6%。()
背景资料:某承包人承接了一座大桥工程,该桥采用的桩基础,桩长约25~32m;桥住处地层均为天然砂砾,地下水位在原地面下约1.5m处。其桩基主要施工过程如下。平整场地、用水准仪进行桩位放样、埋设钢护筒、选用正循环回旋钻机作为成孔钻机,终孔
某企业2012年实现销售收入2480万元,全年固定成本570万元,变动成本率55%,所得税税率25%。2012年应用税后利润弥补上年度亏损40万元。按10%提取盈余公积金,向投资者分配利润的比例为可供分配利润的40%。 要求:计算2叭2年可供分配
(2012年)下列属于合伙企业的投资者可变更个人所得税汇算清缴地点的情形有()。
阅读材料,回答问题。材料一石嘴山位于贺兰山脉以东,黄河西岸,是宁夏回族自治区的地级市。它是一座新兴的城市,号称“塞上煤城”,因生产无烟煤——太西煤而闻名中外。材料二下图为“宁夏示意图”。从地理角度分析贺兰山给宁夏带来的有利影响。
公安机关有权做出的治安行政处罚是()。
最新回复
(
0
)