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
25
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
AimlessnesshashardlybeentypicalofthepostwarJapanwhoseproductivity
Whatdoesthepassagemainlydiscuss?[br]Theword"postulated"inline19isc
ThepassagefocusesontheneedforAmericanstolearnforeignlanguages.[br]T
蜗静脉共有几条A.6~8条 B.3条 C.2条 D.5~7条 E.4~6
能消食除胀、下气化痰的药物有A.苍术 B.麦芽 C.莱菔子 D.厚朴
2001-111.组成药物中含生地、白芍的方剂是 A.杏苏散B.败毒散C.
赵某,女,20岁.大学二年级学生.体健.无躯体不适,由同学陪伴来心理咨询室。陪伴
我国针对国际收支顺差采取的政策包括()A.逐步放宽和取消经常项目下的外汇管制
根据企业破产法律制度的规定,下列主体中可以承担管理人的是( )。A.因盗窃行为受
征税对象的数额未达到起征点的不征税,达到起征点的就其超过起征点的数额征税。
最新回复
(
0
)