永发信息网

Why did humans evolve to walk upright? Perhaps because it’s just plain easier. Make that “

答案:2  悬赏:40  手机版
解决时间 2021-12-26 05:05
Why did humans evolve to walk upright? Perhaps because it’s just plain easier. Make that “energetically less costly”, scientifically speaking.
Bipedalism—walking on two feet, is one of the defining characteristics of being humans, and scientists have debated for years how it came about. In the latest attempt to find an explanation, researchers trained five chimps(黑猩猩)to walk on a treadmill(跑步机)while wearing masks that allowed measurement of their oxygen consumption. The chimps were measured both while walking upright and while moving on their legs and knuckles(膝关节).That measurement of the energy needed to move around was compared with similar tests on humans and the results are published in this week’s online edition of “Proceedings of the National Academy of Sciences”.
It turns out that humans walking on two legs use only one-quarter of the energy that chimps use while knucklewalking on four limbs(肢).And the chimps, on average, use as much energy using two legs as they did when they used all four limbs.
However, there were differences among chimps in how much energy they used, and this difference corresponded to their different manner of walking and anatomy(解剖构造).One of the chimps used less energy on two legs, one used about the same and the others used more, said David Raichlen, assistant professor of anthropology at the University of Arizona.
“What we were surprised at was the variation(变异) ”, he said in a telephone interview. Interview. “That was pretty exciting, because when you talk about how evolution works, variation is the bottom line, without variation there is no evolution.”
Walking on two legs freed our arms, opening the door to drive the world, said Raichlen. “We think about the evolution of bipedalism as one of first events that led hominids(原始人)down the path to being humans.”
The research was supported by the National Science Foundation and the L.S.B.Leakey Foundation.
【小题1】 The underlined word “Bipedalism” in Paragraph 2 probably means .A.moving sidewaysB.walking uprightC.walking on four legsD.running fast【小题2】We can infer from the passage that .A.scientists have no idea on how humans’ walking on two legs came aboutB.scientists have had different views on why chimps walk on four legsC.scientists have had different views on how humans’ walking on two legs vame aboutD.scientists have had similar views on how humans’ walking on two legs came about【小题3】What is Paragraph 4 mainly about?A.How chimps saved energy.B.Why chimps didn't walk on two legs.C.David Raichlen studied chimps.D.Different chimps consumed different energy.【小题4】 According to the passage, humans walk upright in order to .A.conserve energyB.differ from other animalsC.free their brainsD.strengthen their legsB
最佳答案
(答案→)B 解析:【小题1】破折号后的内容即是对Bipedalism的解释,故B项正确。【小题2】由第二段第一句可知。【小题3】第四段主要讲了不同的黑猩猩直立行走所消耗的能量是不同的。【小题4】通过全文可知,人类直走的目的是为了减少能量的消耗。
全部回答
感谢回答
我要举报
如以上问答信息为低俗、色情、不良、暴力、侵权、涉及违法等信息,可以点下面链接进行举报!
大家都在看
下列说法中正确的是A.物体运动得越快,物体的
Is there something that you’ve always wan
中国医学考试网怎样修改基本信息的照片
诗情爱意赋青苔阅读答案
抠喉咙为什么会造成呕吐?
在哈尔滨开冷面馆怎么样
They lived in a beautiful village, with ma
买玉器,要怎么选,怎么鉴别,什么颜色的好?
有没有什么人脸识别软件可以辨别2张照片是不
家居公司属于什么行业
下列事件中,是随机事件的是①从10个玻璃杯(
l怎样破当头炮
上庄水库目前可以钓鱼吗?
Shetoldussomething________aboutHal
英语翻译:晚上有没有节目?有没有饭吃?
推荐资讯
1.下列各项中对作品故事情节的表述,不正确的
单选题Harbinisabeautifulcity._________peo
盐津县森林公安局普洱派出所地址在哪?我要去
Doyouwantto________aninternational
梦见井水上涨
△ABC和△A′B′C′中,①AB=A′B′②BC=B′C
使用什么功能可以将光标锁定在预先定义的位置
观书有感本诗把什么比作半亩方塘,天光云影比
我们常说的“震耳欲聋”“声音刺耳”“闻其声
Poping身体部位的WAVE怎样快速练成?拜托了各
奉贤区庄行工商所地址在哪?我要去那里办事
从天津塘沽开车到辽宁朝阳的路线
正方形一边上任一点到这个正方形两条对角线的
阴历怎么看 ?