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
2018-03-16
40
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/SDWd777K
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
Accordingtothepassage,theexpansionofpopularjournalismwaslinkedto______.Whatdoestheauthormeanbythestatement"
InJapanyoushouldholdabusinesscardwith______andreadthenameandriflecarefully.
Accordingtothepassage,thegreatestpartofthesolarenergythatreachestheEarthis______.Whichofthefollowingbestd
Asinternationalcommercegrows,thereisanamazingdevelopmentwhichisexpandingatever-increasingrate—businessontheInte
BetweenWTOandGATT______.Accordingtothispassage,______undertheWTO.
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
Wherecantheexpression"lameduck"beheard?
WhendidDr.Hubergethisowntelescope?
WhendidDr.Hubergethisowntelescope?
WhendidDr.Hubergethisowntelescope?
随机试题
矩形牙嵌离合器的齿侧通过工件轴线的切向平面。()
男,65岁。排尿困难2年,尿线细,射程短,排尿时间延长。1天前因感冒后突发不能自行排尿,下腹区胀痛难忍。应先行
【2019年真题】在喷漆厂房内,硝基物质的漆料和稀释剂喷成雾状扩散后能与空气形成爆炸性混合物,遇火源便会发生燃烧爆炸。下列关于喷漆作业及场所安全要求的说法中,错误的是()。
灌溉分水闸招标时共有甲、乙、丙、丁四家单位购买了招标文件,其中甲、乙、丙参加了由招标人组织的现场踏勘和标前会,现场踏勘中甲单位提出了招标文件中的疑问,招标人现场进行了答复,根据有关规定,招标人应将解答以书面方式通知()。
下列非关税壁垒的特点说法错误的是()。
某商厦有一辆客货两用汽车,为顾客送货,乘客座位4人,排量1.0升,整备质量2.1吨。当地省政府规定,该排量乘用车车船税年税额为200元/辆,相同整备质量的货车车船税年税额为40元/吨,商厦每年应缴纳车船税()元。
加法的学习影响着乘法的学习,而乘法的学习反过来也影响着对加法的重新理解,这在心理学中叫——。
ToMissDoughty16September1962,SundayMydear,Well,hereweare-butnothere.YouareinPrinceton,andmeinQuogu
Microsoftemployeesdonotrecognizethemselvesinthegovernment’ssuitsintheMicrosoftcafeteriainRedmond,Washington.The
Reebokexecutivesdonotliketoheartheirstylishathleticshoescalled"footwearforyuppies(雅皮士•少壮高薪职业人士)".Theycontendth
最新回复
(
0
)