首页
登录
职称英语
[originaltext] Human beings have used tools for a very long time. In some pa
[originaltext] Human beings have used tools for a very long time. In some pa
游客
2024-06-15
13
管理
问题
Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did net have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily.
Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to the success of mankind.
Since 1960 a new kind of tool has appeared. This is the silicon chip—a little chip of silicon crystal. It is smaller than a finger-nail, but it can store more than a million bits of information. It is an electronic brain. Every year these chips get cleverer, hut their size gets smaller, and their cost gets less. They are used in watches, calculators and intelligent machines that we can use in many ways.
In the future we will not need to work with tools in the old way. Machines will do everything for us. They will even talk and play games with us. People will have plenty of spare time.
选项
A、They made them by knives.
B、They found adequate stones.
C、They used bones of animals.
D、They made tools by hitting stone against stone,
答案
D
解析
How did people make tools two million years ago?
转载请注明原文地址:https://tihaiku.com/zcyy/3634602.html
相关试题推荐
[originaltext]M:No.11PoliceStation.CanIhelpyou?W:Yes.It’saboutmyson
[originaltext]M:Goodmorning.WillyoubookaplanetickettoLondonforme?
[originaltext]M:Haveyougoteverythingnow?W:No.Istillhavetogetapound
[originaltext]M:AreyoureallyleavingforHawaii,Mary?W:Ithinkso,I’vegot
[originaltext]M:Excuseme,canyoutellmewherethebookstoreis?W:Yes.They
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefor
[originaltext]W:Howareyougettingon,White?AreyoustillworkingfortheMe
[originaltext]M:Thetypewritercosts900yuanbutIhaveonly700yuan.W:Ihav
[originaltext]M:I’dlovetodance,butIdon’tknowthesteps.W:Itdoesn’tmat
[originaltext]W:Youwereabsentfromworkyesterday,Brown.M:I’mterriblysorr
随机试题
Itisthemarkofaneducatedmindtorest______withthedegreeofprecisionw
[originaltext]Greekarcheologistssaythey’veuncoveredthelargestundergro
Theirperformanceleftadeep(impress)______onme.impression他们的表演给我留下了深刻的印象。名词
[originaltext]M:IwashopingthatwewouldseeGeorgeheretoday.W:Hewaspla
癫痫发作不包括A.强直-阵挛发作 B.强直性发作 C.失神发作 D.精神症
患者,女性,58岁。患2型糖尿病3年,肥胖体态,目前空腹血糖11.6mmol/L
某投机者以8.00美元/蒲式耳的执行价格卖出1份9月份小麦看涨期权,权利金为0.
Thechangeinthatvillagewasmiraculou
下列关于经济周期的说法正确的是()。A.当经济处于潜在产出水平以下时,实际失业率
关于施工组织设计(方案)的说法,正确的有()。A.施工组织设计应由项目负责
最新回复
(
0
)