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
29
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
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreatple
Itisusefultobeabletopredicttheextent______whichapricechangewilla
急性胃炎的急诊胃镜检查应在上消化道出血后A.一周内进行 B.5天内进行 C.
A.牛蒡解肌汤 B.龙胆泻肝汤 C.仙方活命饮 D.银翘散 E.五神汤合
小儿从出生后到满1周岁之前,应属A.新生儿期 B.幼儿期 C.婴儿期 D.
老师问小明:“为什么偷东西是不对的”他回答:“抓住了会挨打。”据此可以判断小明的
计算企业生产发展速度和主要比例关系、一些经济指标的依据是( )。A.工业总产值
下列关于动态投资回收期的描述中,正确的是( )。A.动态投资回收期与静态投资回
(2018年真题)跨越深沟的高路堤公路涵洞,适宜的形式是()。A.圆管涵
所谓管理是由提出问题、筹划、决策、执行和检查等多个环节组成的过程。下列选项中属于
最新回复
(
0
)