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
27
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
FilmExchangesinAmerica’sEarlyMovieIndustry1.Motionpictu
以下给出的地址中,属于子网197.182.15.19/28的主机地址是()A.1
A.L~L椎间盘突出 B.L~L椎间盘突出 C.L~S椎间盘突出 D.L~
俗话说“食不言,寝不语。”吃饭时不能大声说笑的科学道理是()。A.食物容易由
A.桂枝汤 B.桑杏饮 C.麻杏石甘汤 D.银翘散 E.栀子豉汤治疗热扰
学习型组织中,终身学习的属性包括( )A.个体属性 B.社会属性 C.中介
原位溶血见于( )。A.骨髓增生异常综合征 B.巨幼细胞贫血 C.输血性溶
诊断主动脉瓣关闭不全最重要的体征是A.周围血管征 B.主动脉瓣区叹气样舒张期杂
(2016年真题)执行价格又称()。A.履约价格 B.敲定价格 C.交
为了解某市中学生的吸烟情况,研究者于2009年随机抽取该市5所中学389名学生(
最新回复
(
0
)