首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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 tha
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 tha
admin
2013-10-11
24
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 most 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. But what will they do with it?
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. What will life be like twenty years from now? What will the world be like two million years from now?
The stone chip is thought to be the most important tool because it______.
选项
A、was one of the first tools.
B、developed human capabilities.
C、led to the invention of machines.
D、was crucial to the development of mankind.
答案
D
解析
本题询问细节,相关语句为第二段末尾的“The stone chip …and it is the most important.Some scientists say that it was the key to the success of mankind”。这两句话存在内在的因果联系:正因为石器的使用成为人类发展的关键,石器被认为是最重要的劳动工具。
转载请注明原文地址:https://kaotiyun.com/show/gmGK777K
0
专业英语四级
相关试题推荐
Therearetwobasicwaystoseegrowth:oneasaproduct,theotherasaprocess.Peoplehavegenerallyviewedpersonalgrowtha
WhichofthefollowingisTRUEaboutthenewlibrary?
Idon’tremembersayinganythinglikethat.Youarepurposely______mywordstoproveyourpoint.
Theabilityoffallingcatstorightthemselvesinmidairandlandontheirfeethasbeenasourceofwonderforages.Biologist
WherewastheWorldDigitalLibraryestablished?
Whencoal,the______ofplants,isburnt,chemicalenergyischangedintoheatenergy.
Welookedforatabletositdown,buttheywereall______.
JoeSmithtelephonedVictoriafor______.
Theworldisgoingthroughthebiggestwaveofmergersandacquisitionseverwitnessed.TheprocesssweepsfromhyperactiveAmer
Theworldisgoingthroughthebiggestwaveofmergersandacquisitionseverwitnessed.TheprocesssweepsfromhyperactiveAmer
随机试题
课外活动最适合的组织者、指导者是()。
多形渗出性红斑属于A.感染性疾病B.传染性疾病C.变态反应性疾病D.遗传性疾病E.自身免疫性疾病
患者,女性,21岁。自诉疼痛开始于上腹及脐周,位置不定,以后疼痛位置转移到右下腹部,并出现全腹持续性疼痛。体检示:体温39.2℃,脉搏124次/分钟,血压105/65mmHg;右下腹压痛,肌紧张,有反跳痛,肠鸣音消失;WBC12.5×109/L,中性粒细
信用证支付方式是随着国际贸易的发展,在银行与金融机构参与国际贸易结算的过程中逐步形成的。关于信用证描述正确的是()。
以下基金品种中适用我国《证券投资基金法》的是()。
某企业2015年初委托施工企业建造仓库一幢,9月末办理验收手续,仓库人账原值400万元;9月30日将原值300万元的旧车间对外投资联营,不承担联营风险,当年收取固定收入10万元。当地政府规定房产原值扣除比例为30%。2015年度该企业上述房产应缴纳房产税(
某公司打算投资一个项目,预计该项目需固定资产投资1000万元,为该项目计划借款筹资1000万元,年利率为4%,每年年末付当年利息。该项目没有建设期,可以持续6年。估计每年固定成本为(不含折旧)100万元,变动成本是每件200元。固定资产折旧采用直线法,折旧
资本资产定价模型是估计权益成本的一种方法。下列关于资本资产定价模型参数估计的说法中,正确的有()。
调查发现,个别地方和单位的负责人,工作中存在虚报浮夸、弄虚作假的现象。群众意见比较大。你认为应当如何解决这个问题?
判断对错。例如:我想去办个信用卡,今天下午你有时间吗?陪我去一趟银行?★他打算下午去银行。(√)现在我很少看电视,其中一个原因是,广告太多了,不管什么时间,也不管什么节目,只要你打开电视,总能看到那么多的广告,浪费我的时间。
最新回复
(
0
)