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
2019-10-21
27
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/FqWd777K
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
Pollutionisa"dirty"word.Topollutemeanstocontaminate—tospoilsomethingbyintroducingimpuritieswhichmake(31)unfit
ArecenttrialhasgotridofAmerican’sinterestintheproblemofviolenceagainstwomen.
Aneconomistissomeonewhoknowsalotabouthowgoodsandwealthareproducedandused.Food,for(31),isakindofgoods.Ev
Americanscientistsinvarietyofdisciplinescontinuetostruggletostart______.
Accordingtothetext,whatistheStockExchange?Accordingtoparagraph3,whathappenedon16thNovember,1971?
ThespeakerknowsafewChinesestudents.
Theauthor’spurposeinthepassageisto______.Accordingtothepassage,peopleinJapanbelievethatachildisborn______.
Theauthorholdsthatengineeringandhumanitieshavetheleastincommon.Theauthor’ssecondaryschoolambitionwastomajor
______resultsin"Acidrain"?______islessthreatenedbyinternationalcrises?
Ittakesonlyatinymagneticfieldtoseeclearthroughaperson’shead,anewstudyshows.Amethodcalledultra-lowfieldmag
随机试题
A、Inapharmacologycourse.B、Fromhermother.C、Atthestudenthealthcenter.D、Fromherdoctor.B从“Mymotherusedtolookup
某县医院在处方检查中发现某医师开具了3张超常处方,医院领导询问其原因,该医师未能作出合理解释。于是,医院根据相关规定对其作出了处理。该处理是
炒王不留行的火候应选用()。
权利瑕疵担保[北科2011年研;南京大学2007年研]
卢森堡的优势在于()。
肖特有音乐天赋,16岁便不再上学,以演出收入为主要生活来源。肖特成长过程中,多有长辈馈赠:7岁时受赠口琴1只,9岁时受赠钢琴1架,15岁时受赠名贵小提琴1把。根据《民法总则》的规定,下列对肖特行为能力及其受赠行为效力的表述正确的是()。
根据反垄断法律制度的规定,在经营者集中附加限制性条件批准制度中,剥离业务的买方应当符合的要求有()。
军国民教育会
Pageants(露天表演)areusuallyconceivedonafairlylargescale,oftenundertheauspices(由……主办)ofsomelocalorcivicauthorityo
To:SalesStaffFrom:EdwardHouse,SolepadAssistantManagerSubject:SilvercupGiftCertificateToencourageeveryonetosell
最新回复
(
0
)