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
2024-02-07
26
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. 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. Some scientists say that it was the key to 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 fingernail, 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. Human beings used stone chips for more than two million years, but human life changed very little in that time. We have used silicon chips for only a few years, but life is changing faster every day.
23. How did early human beings make tools two million years ago?
24. What’s the difference between the stone chips and the silicon chips?
25. What is the passage mainly about?
选项
A、They made tools with special instruments.
B、They made tools out of wood first.
C、They made tools out of animal skin.
D、They made tools out of stones first.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3430915.html
相关试题推荐
[originaltext]M:Doyoufeellikegoingtothecinema,Liz?W:Ohyes,let’sdo
[originaltext]W:WelcometoJoe’sHamburgerRestaurant,homeoftheone-pounds
[originaltext]W:WelcometoJoe’sHamburgerRestaurant,homeoftheone-pounds
[originaltext]W:WelcometoJoe’sHamburgerRestaurant,homeoftheone-pounds
[originaltext]W:Johnmusthavebeenjokingwhenhesaidthathewasgoingtoq
[originaltext]W:Johnmusthavebeenjokingwhenhesaidthathewasgoingtoq
[originaltext]W:Johnmusthavebeenjokingwhenhesaidthathewasgoingtoq
[originaltext]W:Johnmusthavebeenjokingwhenhesaidthathewasgoingtoq
[originaltext]W:Johnmusthavebeenjokingwhenhesaidthathewasgoingtoq
[originaltext]W:Lookwhatamessyou’vemade!I’vetoldyouseveraltimes,but
随机试题
元宵节(LanternFestival)是在阴历的(lunar)一月十五日。早在西汉时期,它已经成为具有重要意义的节日。猜灯笼“谜语”(riddle)
(94)Likefinefood,goodwritingissomethingweapproachwithpleasureand
Duringaverageyear,about50peoplediefromcarbonmonoxidepoisoningin【
关于电子出版物框架结构设计,说法错误的是( )。A.设计体现电子出版物特色的框
计算题:请根据所给材料回答下列问题(要列出计算公式,为计算方便不考虑加放数)。
关于窒息目前诊断参考指标错误的是A.无器官损害 B.Apgar1分钟评分≤7分
A.地高辛B.洋地黄毒苷C.乙胺丁醇D.异烟肼E.呋塞米伴有肝病的结核患者治疗结
A.1:1 B.2:3 C.5:4 D.12:11
C
颈椎病最常见的类型为A、脊髓型 B、交感神经型 C、椎动脉型 D、混合型
最新回复
(
0
)