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
2023-09-17
71
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 not 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 mast 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, but 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:http://tihaiku.com/zcyy/3021334.html
相关试题推荐
[originaltext]Lifeinthetwentiethcenturymustdemandpreparations.Today
[originaltext]Lifeinthetwentiethcenturymustdemandpreparations.Today
[originaltext]M:Hello,Thompsonhere.W:Hello.ThisisMary.M:Oh,hello.W:
[originaltext]M:Hello,Thompsonhere.W:Hello.ThisisMary.M:Oh,hello.W:
[originaltext]W:I’mgoingawaytotheseasideforafewdaysandI’dlikeyou
[originaltext]W:I’mgoingawaytotheseasideforafewdaysandI’dlikeyou
[originaltext]W:I’mgoingawaytotheseasideforafewdaysandI’dlikeyou
[originaltext]Nowwe’realwayshearingaboutroadaccidentsandwhenwe’re
[originaltext]Asweflewinfromtheseatowardstheairport,wepassedove
[originaltext]M:What’sontheTVthisevening?Ifeellikerelaxing.W:Whyas
随机试题
Iwanttoposttheletterbyair.[br]Thisiswheretheylive.B人住的地方应该是[B]house
茶花(camellia)的自然花期在12月至翌年4月,以红色系为主,另有黄色系和白色系等,花色艳丽。本届花展充分展示了茶花的品种资源和科研水平,是近三年
Whilethoseearningmaster’s,doctoral,orprofessionaldegreesstillearnm
中国古代墓葬制度的一次划时代的变化是( )的普遍采用。A.木椁墓 B.砖石墓
商业银行应在每一会计年度终了编制本年度个人理财业务报告。个人理财业务年度报告应全
Whenateacherasksthestudentstofind
除疟原虫外还可通过血液检查的寄生虫为A.微丝蚴B.卡氏肺孢子虫C.隐孢子虫D.旋
我国商业银行合规风险管理的基本制度主要包括()。A.公平竞争制度 B.合规
患儿,男性,1岁,先天性双侧完全性唇裂、双侧完全性腭裂,现拟行唇裂修复术。目前常
电气系统与负荷公共连接点负序电压不平衡度的要求,下列描述哪项是正确的?()A.
最新回复
(
0
)