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
2023-07-06
54
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:http://tihaiku.com/zcyy/2814649.html
相关试题推荐
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]Oneofthebiggesttriggersforemotionaleatingisanger.Ea
[originaltext]Oneofthebiggesttriggersforemotionaleatingisanger.Ea
[originaltext]There’sanewteentrendandthisonejustmayhaveyoublowi
[originaltext]There’sanewteentrendandthisonejustmayhaveyoublowi
[originaltext]There’sanewteentrendandthisonejustmayhaveyoublowi
[originaltext]There’sanewteentrendandthisonejustmayhaveyoublowi
[originaltext]W:Hi,Randall.Comeonin.M:Istoppedbytoseeifyouwerest
[originaltext]M:Honey,thesecondhalfofthebasketballgameisabouttostar
随机试题
Weallknowwhatanadvertisementis;it’s【B1】______messagethatannounce
AGrassrootsRemedyMostofusspendourlivesseekin
[originaltext]EducationexpertssayAfrica’sgrowinghighereducationsyste
下图所示为()设计模式,适用于(请作答此空)。 A.有多个对象可以处理一个
大型项目可能包括一些超出单个项目范围的工作。项目范围是否完成以在( )中规定的
四十岁经产妇,近2年痛经并逐渐加重,伴经量增多及经期延长,届时需服强止痛药。妇科
()是消费者权益保护工作的最高决策机构,负责制定消费者权益保护工作战略、政
2002年6月到2007年6月,网民的年平均增长数约为()。A.1298
在共产主义社会,人们精神境界极大提高,每个人自由而全面的发展,对个人消费品实行“
根据下列国内生产总值表(单位:亿元)回答以下题。 社会总投资I的金额
最新回复
(
0
)