Why Humans Walk On Two Legs A team of scientists that studied chimpanzees trained to use treadmills has gathered new evidence suggesting that our earliest apelike ancestors started walking on two legs because it required less energy than getting around on all fours. The five chimps also wore face masks used to help the researchers measure oxygen consumption. While the chimps worked out, the scientists collected metabolic and other data that allowed them to calculate which method of locomotion used less energy and why. The team gathered the same information for four adult humans walking on a treadmill. We were prepared to find that all of the chimps used more energy walking on two legs but that finding wouldnt have been as interesting, Sockol said. What we found was much more telling. For three chimps, bipedalism3 was more expensive, but for the other two chimps, this wasnt the case. One spent about the same energy walking on two legs as on four. The other used less energy walking upright. These two chimps had different gaits and anatomy than their knucklewalking peers. Fossil and molecular evidence suggests the earliest ancestors of the human family lived in forested areas in equatorial Africa in the late Miocene era some 8 to 10 million years ago, when changes in climate may have increased in distance between food patches. That would have forced our earliest ancestors to travel longer distances on the ground and favored those who could cover more ground using less energy. 词汇: chimp )calorie n. 卡,小卡 treadmill n. 踏轮;踏车;单调工作gait n. 步态,步法 knucklewalk v. 用膝关节走路Quadruped n. 四足动物 locomotion n. 运动 1. UC Davis :加州大学戴维斯分校。UC是University of California 的缩写,该校有多个分校,UC Davis是其中一个。Davis以前是UC Berkeley分校的农学院,后来独立出来。Davis是一个大学城,很小的城市,Davis校园基本就构成了这个城市。 3. bipedalism:系bipedal的对应名词,这里后缀-ism表示特征、特性。 1. What did Michael Sockol and his team find out in their study of chimpanzees? B) The evidence why our apelike ancestors came to walk on four legs. D) The evidence why chimpanzees can be trained to walk on two legs. A) While the chimps worked in the lab. C) While the chimps tried to figure out what they should do.-
职场人每天遗忘五件事 盘点最容易漏掉啥
Tim Cook新政:没了乔布斯,苹果驶向何方?
体坛英语资讯:Israels Maccabi Haifa beat Slovenias NS Mura 2-0 in Europa League
英伦情人休格兰特晋升奶爸 华裔前女友生千金
你穿情侣装了吗?
国际英语资讯:U.S. Fed cuts interest rates for first time since 2008
体坛英语资讯:NBA announces first-of-its-kind strategic partnership with NEX Teams Homecourt application
过了21岁 我们还剩多少朋友?
2019上半年CATTI笔译三级真题(汉译英)
职场女性每天只有30分钟“个人时间”
体坛英语资讯:Alegria advance to AFCON semis after beating Cote dIvoire on penalties
女子临产前考过驾照 自己驱车去医院生产
可口可乐vs 百事:可乐大战背后的故事
英国中产阶级延迟退休以资助子女
国际英语资讯:ASEAN FMs welcome efforts, progress on COC negotiations
国内英语资讯:Chinese, Colombian presidents pledge to promote ties
美新手术20秒让眼珠变蓝 从此不用戴美瞳
川菜是如何征服全世界吃货的?
国际英语资讯:Indias widening fiscal deficit, flat factory output may pave way for rate cut
BBC演练英女王驾崩报道 避免再次失态
My Dream 我的梦想
体坛英语资讯:Tunisia tame Madagascar 3-0 to reach AFCON semis
国内英语资讯:China sets to further boost consumption
纽约立法禁止给猫剪指甲
神舟八号成功发射 万众瞩目期待完美对接
名著欣赏:《芒果街上的小屋》(1)
八月出生孩子学习成绩较差 易成问题少年
让爱情持久弥新的7个小秘密
从营养价值角度谈啤酒
每日饮酒两杯 女性乳腺癌患病风险增高50%
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |