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
2023-07-04
59
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 at 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/2807208.html
相关试题推荐
[originaltext]WhenJustinBassettinterviewedforanewjob,heexpectedth
[originaltext]"TheSanFranciscoBayAreaistheplaypenofcounterculture,
[originaltext]"TheSanFranciscoBayAreaistheplaypenofcounterculture,
[originaltext]Sayyougetintobed,preparedforahealthysevenoreighth
[originaltext]M:Lisa,Lisa!Overhere,darling!It’swonderfultoseeyou.Oh,
[originaltext]W:Goodafternoon,Mr.Jones.IamTeresaChen,andI’llbeinter
[originaltext]W:Goodafternoon,Mr.Jones.IamTeresaChen,andI’llbeinter
[originaltext]W:Goodafternoon,Mr.Jones.IamTeresaChen,andI’llbeinter
[originaltext]M:Idon’tknowwhattodowithTimmy.ThismorningIfoundorang
[originaltext]M:Idon’tknowwhattodowithTimmy.ThismorningIfoundorang
随机试题
下面哪些著作是奥古斯丁的代表作()A.《辨惑篇》 B.《忏悔录》 C.《论
毛泽东思想初步形成的重要标志是( )A.在分析中国社会各阶级的基础上,提出党在
A.丁香柿蒂汤 B.旋覆代赭汤 C.半夏泻心汤 D.柴胡疏肝散 E.蒿芩
免疫荧光标记中,下列哪种荧光染料可以产生亮绿色的荧光A.FITCB.德州红C.藻
赛马^¥尺V∴MuB∵WǔR乌尸力塞¥∠A.4 B.3 C.2 D.1
关于社会保险,下列说法正确的是()A.职工个人不缴纳工伤保险费 B.领取失业保
照明线路的导线截面应按计算电流进行选择,某一单相照明回路有2只200W的卤钨灯和
确定机电工程项目施工顺序原则有()。A.突出主要工程 B.满足先地上后地下
下列关于氧化镁电缆说法错误的是()。A.电缆允许长期工作温度为250℃ B.
速动资产包括()等。A.存货 B.待摊费用 C.应收票据 D.预付账款
最新回复
(
0
)