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
44
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
Nomatterwhatyoursituationis’,oneofthegreatestdangersnowisthatyou’llstopdoingwhatyou’realreadydoingright.
Paragraph2seemstosuggestthat______Inparagraph5,thephrase"wallowingin"maybereplacedby______
InJapanyoushouldholdabusinesscardwith______andreadthenameandriflecarefully.
WhatdoboththeoriesassumetobeTRUE?AccordingtoHoyleandhisfriendsatCambridge______.
Thewriterholdsthatthepotentialtomakehealthybodytissueswill______.Whichofthefollowingistrueaccordingtothet
Accordingtothepassage,thegreatestpartofthesolarenergythatreachestheEarthis______.Accordingtothepassage,atm
WhendidDr.Hubergethisowntelescope?
WhereCantheexpression“lameduck”beheard?
WhendidDr.Hubergethisowntelescope?
Wherecantheexpression"lameduck"beheard?
随机试题
活血行气止痛作用强,研末服即有效的药物是
子宫脱垂Ⅲ度为
下列关于隧道施工的安全要点的说法,正确的有()。
在社会总需求不变的情况下,由于厂商的退出使总供给减少,引起价格上涨,即形成由供给因素变动的通货膨胀,可以归结为两类原因。下列选项属于两类原因的有()。
Howlongcanhumanbeingslive?Mostscientistswhostudyoldagethinkthatthehumanbodyis【C1】______tolivenolongerthan1
下列关于我国村民委员会的表述,正确的是()。
设an是绝对收敛的级数,证明由an的一切正项组成的级数pn是收敛的;由an的一切负项组成的级数(一qn)也是收敛的。
在考生文件夹下,存在一个数据库文件“sampl.accdb”,里边已建立“tGrade”和“tStudent”两个表对象;同时还存在一个Excel文件“tCourse.xls”。试按以下操作要求,完成表的编辑:设置“tStudent”表的显示格式,使表
GesturesI.Universalusageofgesturesincommunication1)GesturesarewidelyusedespeciallyinArabcountries.2)Gesturesh
I’dratheryou______thoseimportantdocumentswithyou.
最新回复
(
0
)