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
A、Theories of how the universe evolved. B、Similarities between the planets in the solar system. C、Reason for the high density of
A、Theories of how the universe evolved. B、Similarities between the planets in the solar system. C、Reason for the high density of
admin
2019-10-03
28
问题
We are going to talk today about the moon, our moon. First of all, the earth’s moon is unusual. Why? It’s larger than other moons or satellites in the solar system, in relation to its planet that is. Its diameter is more than a quarter that of the earth. And if you compare the earth and the moon in terms of substance, you find the moon isn’t much like the earth. For example, the earth has a significant iron core, but the moon contains very little heavy materials like iron. That’ s why its density is much lower than that of the earth. Now, one time it was believed that the moon and the earth were formed at the same time from the same material. But then wouldn’t the moon have as much iron as the earth? Another theory is that the moon was formed elsewhere in the solar system, and then it was captured, so to speak, by earth. But study shows that the young earth would not have had enough gravitational force to stop a body the size of a moon from traveling through the solar system and pull it into orbit. The newest theory is called the big splash theory. Here, the new young earth was hit by another big planet. Most of the colliding planet entered the earth and became part of it. But the huge impact created a vapor that shed out into space and eventually condensed as the moon. Because this material came mostly from the earth surface crust, not the iron core, the moon contains almost no iron. Well, as plausible(似是而非) as it sounds, it’ s only a theory, and we can’t be sure that this is what really happened, that this is how the moon originated. Plenty of research remained to be done.
Now listen to the following recording and answer questions 20 to 22.
20. What does the Prof. mainly discuss?
21. According to the Prof, why do scientists disagree with the theory that earth captured the moon?
22. What information about the moon’ s composition helps support the big splash theory?
选项
A、Theories of how the universe evolved.
B、Similarities between the planets in the solar system.
C、Reason for the high density of earth.
D、Theories of the origin of the Moon.
答案
D
解析
主旨题。根据第一句话和通篇内容可知,本演讲主要讨论的是月球起源。因此,正确答案为D。
转载请注明原文地址:https://kaotiyun.com/show/a5W7777K
0
大学英语六级
相关试题推荐
A、Asenseofhumor.B、Goodlook.C、Intelligence.D、Outgoing.A
A、TheclasshasbeenassignedtoreaditinEnglish.B、HewasabletoreaditinFrench.C、Heisn’tsureit’savailableinEng
AstudyconductedbyanAustralianscienceagencyhasdiscoveredsignsthatthecountry’sancientAboriginesmayhavebeenthew
ConradHiltonreallywantedtobeabanker.Instead,hesuccessfullychangedthe【C1】______purchaseofaTexaslow-endhotelinto
VictoriaBarzilaiopenedhermouthwidesothedoctorcouldlookathersorethroat.Not【C1】______aremarkableevent,excepttha
A、Runaroundandhavefun.B、Getstartedonacareer.C、Prepareagoodresumeforinterviews.D、Datewiththepurposeofmarriag
A、Leaningtorelaxthemselvesbeforeaudience.B、Listeningtocelebrities’publicspeakingasoftenaspossible.C、Speakinginp
A、ThePacificOcean.B、SanJoaquinValley.C、MojaveDesert.D、OregonandWashington.D细节题。根据文章最后一段CaliforniahasitsPacificcoa
A、Runaroundandhavefun.B、Getstartedonacareer.C、Prepareagoodresumeforinterviews.D、Datewiththepurposeofmarriag
随机试题
一般认为角膜缘的后界止于
急性期血吸虫病最常见的临床特征是有症状型慢性期血吸虫病最常见的临床症状是
麻醉药品包括
专家认为最符合现代经销观念的组织是()。
下列哪个场所或部位,可以不考虑设置可燃气体报警装置?
冲刷防护中丁坝的横断面一般为()。
下列井道防火分隔要求中,说法错误的有()。
违反会计法律制度规定行为应承担的法律责任包括( )。
巨额赎回是指开放式基金单个开放日基金净赎回申请超过基金总份额的()。
假如我和你辩论,我们之间能够分出真假对错吗?我和你都不知道,而所有其他的人都有成见,我们请谁来评判?请与你观点相同的人来评判。他既然与你观点相向,怎么能评判?请与我观点相同的人来评判。他既然与我观点相同,怎么能评判?请与你、我的观点都不相同的人来评判。他既
最新回复
(
0
)