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
32
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
Whatproblemdoesthewomanmention?[br][originaltext]W:Hi,Aaron.It’sEdna
Moststudentshavelefttheuniversityfor______.[originaltext]Whatdomostst
TheWhiteHouseistheofficialresidenceofthePresidentoftheUnitedSt
在评价和考核实际成本时,往往需要使用插值法来计算“实际业务量的预算成本”的弹性预
男,12岁,体育锻炼时不慎摔倒,左肘着地,局部肿痛,畸形,左肘活动受影响,经诊断
静脉采血首选部位是( )。A.手背静脉 B.内踝静脉 C.肘部静脉 D.
关于甲状腺激素T和T,表述正确的是A.生物活性T较低B.T作用快而强,维持时间短
上世纪90年代以来,随着高技术的发展,地震预测研究开拓了新领域。一些国家应用现有
关于办公建筑内人员使用面积的说法,下列错误的是()。A.普通办公室每人使用面积
分析薪酬战略的影响因素。
最新回复
(
0
)