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
43
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:https://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
Whenaconsumerfindsthatanitemsheorheboughtisinfaultyorin
Thelinkbetweenhealthandincomeseemsprettyuncontroversial.【C1】______al
电喇叭上共鸣片、膜片、衔铁及()刚性连为一体。A.上铁心 B.下铁心 C.
A.x轴 B.y轴 C.z轴 D.直线x=y=z
建筑施工企业管理人员安全生产考核包括全生产知识考核和()考核,A.安全生产技能
根据规模细分的各子市场中,商业银行应重点争取的客户群为( )。A.工业企业
小明用GoldWave软件截取一段背景音乐如下图所示,当前选定部分的音频长度为(
下列属于金融期货交易制度的有()。 ①.集中交易制度 ②.标准化的期货
关于判决和裁定,下列做法正确的是:() A.最高人民法院的判决和裁定是发生法
背景 某机电工程公司承接了一座110kV变电站建设项目,工期一年,时间紧、任务
最新回复
(
0
)