相关问题推荐
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著名的邓巴数理论认为，人类智力许你拥有稳定社交人数最多为150人但这并不排除人类在社交生活中重新设定认知上限的可能性——人类已经傲到过这一点。与其他灵长目近亲相比，人类之所以能应付规模大得多的社交圈，原因在于数万年前人类发明了语言。狒狒通过轮流抓虱子的方式来巩固感情，而人类用修辞、八卦、演说、唱歌、讲故事和开玩笑等方式聚到一起。正是语言使得人类大脑的处理能力扩大到了150人。除非_____，否则我们的社交能力仍将保持在150人。
A.人类大脑处理信息的能力加速进化
B.网络化社交得到长足发展
C.彼此沟通的成本进一步降低
D.有像语言那样具有革命性意义的事物出现
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When global warming finally came, it stuck with a vengeance（异乎寻常地）.In some regions, temperatures rose several degrees in less than a century. Sea levels shot up nearly 400 feet. flooding coastal settlements and forcing people to migrate inland. Deserts spread throughout the world as vegetation shifted drastically in North America. Europe and Asia. After driving many of the animals around them to near extinction, people were forced to abandon their old way of life for a radically new survival strategy that resulted in widespread starvation and disease. The adaptation was farming: the global-warming crisis that gave rise to it happened more than 10,000 years ago.
As environmentalists convene in Rio de Janeiro this week to ponder the global climate of the future, earth scientists are in the midst of a revolution in understanding how climate has changed in the past-and how those changes have transformed human existence. Researchers have begun to piece together an illuminating picture of the powerful geological and astronomical forces that have combined to change the planet&39;s environment from hot to cold, wet to dry and back again over a time period stretching back hundreds of millions of years.
Most important. scientists are beginning to realize that the climatic changes have bad a major impact on the evolution of the human species. New research now suggests that climate shifts have played a key role in nearly every significant turning point in human evolution: from the dawn of primates(灵长目动物) some 65 million years ago to human ancestors rising up to walk on two legs. from the huge expansion of the human brain to the rise of agriculture. Indeed, the human history has not been merely touched by global climate change, some scientists argue, it has in some instances been driven by it.
The new research has profound implications for the environment summit in Rio. Among other things, the findings demonstrate that dramatic climate change is nothing new for planet Earth. The benign(宜人的) global environment that has existed over the past 10,000 years-during which agriculture. writing, cities and most other features of civilization appeared-is a mere bright spot in a much larger pattern of widely varying climate over the ages. In fact, the pattern of climate change in the past reveals that Earth&39;s climate will almost certainly go through dramatic changes in the future-even without the influence of human activity.
测试题
Farming emerged as a survival strategy because man had been obliged__________．
A.to give up his former way of life
B.to leave the coastal areas
C.to follow the ever-shifting vegetation
D.to abandon his original settlement
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下列与动物分类有关的说法，错误的是：
- A.狮、虎、豹都是大型猫科动物
- B.长臂猿和大猩猩同属于灵长目
- C.节肢动物门的动物种类最多
- D.鳄鱼和大鲵都属于两栖动物
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鼠疫耶尔森菌的储存宿主是
A、啮齿目
B、灵长目
C、蚤目
D、偶蹄目
E、翼手目
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共用题干Vision
Human vision like that of other primates（灵长目）has evolved in an arboreal（丛林）environment.______(46)
In the course of evolution,members of the primate line have acquired large eyes while the nose has shrunk.______ (47) Of mammals（哺乳动物）only humans and some primates enjoy color vision.______(48)Horses live in a single-color world.
Light visible to human eyes,however,occupies only a very narrow band in the whole electromagnetic spectrum（光谱）.Ultraviolet rays（紫外线）are invisible to humans though ants and honeybees are sensitive to them.______(49)The world would look terribly different if human eyes were、 sensitive to infrared radiation（红外线）.Then instead of the darkness of night,we would be able to move easily in a strange shadowless world.______(50)
But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by complicated technical devices. _________（50）A:Humans have no direct perception of infrared rays.B:In the dense complex world of a tropical forest,it is more important to see well than to develop an acute sense of smell.C:That gives the eye a wilder view.D:The red flag is black to the bull.E:There are different mammals in tropical forest.F: In this world,objects glowed with varying degrees of intensity.