首页
登录
职称英语
[originaltext] Human beings have used tools for a very long time. In some part
[originaltext] Human beings have used tools for a very long time. In some part
游客
2024-01-21
48
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. (23) 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. (24) The stone chip was one of the first tools that people used. Some scientists say that it is the key to success of mankind. Since 1960, a new kind of tool has appeared. That 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, (25)but life is changing faster every day.
23. How did early human beings make tools two million years ago?
24. Why is the stone chip thought to be an important tool?
25. What is the future like according to the speaker?
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/3380935.html
相关试题推荐
[originaltext](1)Pupilsinthepoorestcountriesaresufferingfromalack
[originaltext](1)Pupilsinthepoorestcountriesaresufferingfromalack
[originaltext](5)Morethan100000peopleayearinJapanleavetheirjobs
[originaltext]IntheseasidetownofBrightoninsouthernEnglandtherulin
[originaltext](4)FloridaisthestatewhereAmericansandimmigrantschoos
[originaltext]Aforty-year-oldfatheroftwo,SteveVaughttookthefinals
[originaltext]Theworld’srichest10%areresponsibleforhalfofallcarbo
[originaltext]Theworld’srichest10%areresponsibleforhalfofallcarbo
[originaltext]Communitysupportedagriculturefarms,orCSAs,seekpeoplew
[originaltext]Communitysupportedagriculturefarms,orCSAs,seekpeoplew
随机试题
InrecentyearsAmericansocietyhasbecomeincreasinglydependentonitsuni
CardinalMezzofantiofBolognawasasecularsaint.Thoughheneverperforme
TheCongresshasthepowertoimpeachthePresidentoftheUnitedStateswhenhe
Lessthan60%ofstudentsnowenteringfour-yearAmericancollegesarelikel
证明消费者最优决策的对偶性
简述需要学说在护理实践中应用的意义。
下列各项中,不属卫生法基本原则的是( )。A.卫生保护原则 B.预防为主原则
A.心经 B.肺经 C.肝经 D.肾经 E.脾经黄芩、桑白皮主归
A.急性膀胱炎 B.急性肾盂肾炎 C.泌尿系结核 D.膀胱肿瘤 E.膀胱
与金黄色葡萄球菌毒力有关的因素A.形成血浆凝固酶的能力 B.特异性细胞糖类的存
最新回复
(
0
)