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
Evolutionary theories. The Belgian George Lemaitre proposed the idea that about 20, 000 million years ago all the matter in the
Evolutionary theories. The Belgian George Lemaitre proposed the idea that about 20, 000 million years ago all the matter in the
admin
2014-01-27
86
问题
Evolutionary theories. The Belgian George Lemaitre proposed the idea that about 20, 000 million years ago all the matter in the universe—enough, he estimated, to make up a hundred thousand million galaxies—was all concentrated in one small mass, which he called the "primeval atom". This primeval atom exploded for some reasons, sending its matter out in all directions, and as the expansion slowed down, a steady state resulted, at which time the galaxies formed. Something then upset the balance and the universe started expanding again, and this is the state in which the universe is now. There are variations on this theory: it may be that there was no steady state. However, Basically, evolutionary theories take it that the universe was formed in one place at one point in time and has been expanding ever since.
Will the universe continue to expand? It may be that the universe will continue to expand for ever, But some astronomers believe that the expansion will slow down and finally stop. Thereafter the universe will start to contract until all the matter in it is once again concentrated at one point. Possibly the universe may oscillate for ever in this fashion, expanding to its maximum and then contracting over again.
The steady-state theory. Developed at Cambridge by Hoyle, Gold and Bodi, the steady-state theory maintains that the universe as a whole has always looked the same and always will. As the galaxies expand away from each other, new material is formed in some ways between the galaxies and makes up new galaxies to take place of those which have receded. Thus the general distribution of galaxies remains the same. How matter could be formed in this way is hard to see, But no harder than seeing why it should all form in one place at one time.
How can we decide which of these theories is closer to the truth? The method is in principle quite simple. Since the very distant galaxies are thousands of millions of light years away, then we are seeing them as they were thousands of millions of years ago. If the evolutionary theory is correct, the galaxies were closer together in the past than they are now, and so distant galaxies ought to appear to be closer together than nearer ones. According to the steady-state theory there should be no difference.
The evidence seems to suggest that there is a difference, that the galaxies were closer together than they are now, and so the evolutionary theory is partially confirmed and the steady-state theory—in its original form at least— must be rejected.
What do both theories assume to be true?
选项
A、That new material is continually being formed.
B、That, in time, the universe will contract.
C、That the universe is expanding at present.
D、That "a big bang" started the expansion.
答案
A
解析
由全文对两种理论对比看,B、C、D均不是两种理论共有的论点,只有A是。
转载请注明原文地址:https://kaotiyun.com/show/CjXd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Forchildrenwithlearningdisabilities,successatreadingandmathematicsisn’talwaysaseasyaslearningtheirABCsorthat
______iswillingtospendalottofollowfashiondesign?______embodiesthedreamofbecomingfamousovernight?
Whatdidthespeakertalkaboutlasttime?
Whatdoesthespeakermainlydiscuss?
Guamisdescribedas______Thetextismostlikelytakenfrom______
WhatisGeorgeOrwellmainlyknownas?
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarmingh
Thefitnessmovementthatbeganinthelate1960sandearly1970scentered(31)aerobicexercise.Millionsofindividualsbecame
Thefitnessmovementthatbeganinthelate1960sandearly1970scentered(31)aerobicexercise.Millionsofindividualsbecame
随机试题
当你正利用WAVE几何链接器时,你的工作部件应是含有将被链接几何体的部件。
有意义学习的概念的提出者是()
下列关于FIDIC施工合同条件中合同担保的说法,正确的是()
炼铁生产过程中,高炉停炉操作时,要利用打水将炉顶温度控制在()℃之间。
下列关于采用预制安装法施工桥梁承载结构,叙述正确的是()。[2009年真题]
地下车站基坑开挖时,应进行中间验收的项目有()。
在教育目的价值取向中,属于文化本位论的代表人物是()。
2008年世界稻谷总产量68501.3万吨,比2000年增长14.3%;小麦总产量68994.6万吨,比2000年增长17.8%;玉米总产量82271.0万吨,比2000年增长39.1%;大豆总产量23095.3万吨,比2000年增长43.2%。将每
(2014上集管)项目收尾过程是结束项目某一阶段中的所有活动,正式收尾该项目阶段的过程。______不属于管理收尾。
MelbourneNamedWorld’sMostLiveableCityforFourthStraightYearMelbourneoutperformed139citiestotoptheEconomistIn
最新回复
(
0
)