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
2019-01-06
127
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/n0H7777K
0
大学英语六级
相关试题推荐
A、Whyhumanscry.B、Howtorelieveourselves.C、Howanimalscry.D、Whenpeoplecry.A主旨题。议论文需注意首句话,此文章第一句“Whydowecry?”就点明了主题:
Educationofexceptionalchildrenmeansprovisionofspecialeducationalservicestothosechildrenwhoareeitherhandicappedo
Nearlytwo-thirdsofbusinessesintheUKwantto【C1】______staffwithforeignlanguageskills.Frenchisstillthemosthighlyp
Forthispart,youareallowed30minutestowriteanessaycommentingontheremark"AcademicDishonestyonCampus".Youshould
TheUnitedNationssaystheworld’spopulationwillincreaseby34percentbytheyear2050.Scientistsandothersknowitwill
Baby-NamingTrendsA)Overthelastfiftyyears,Americanparentshaveradicallyincreasedthevarietyofnamestheygivetheirc
A、Branches.B、Leaves.C、Grass.D、Flowers.D细节题。从Thesecampswerejustgroupsofsimplehousesthatweremadeofbranchesandlea
A、Heisafraidthathischanceofgettingthejobisslim.B、Hewonderswhetherhecanhaveenoughtimetodothejob.C、Hefear
A、Watermightbecomecleanandpure.B、Peoplewillliveinabetterenvironment.C、Therewillbenopolicetoprotectpeople.D、
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimetodramaticallyreviseourestimatesfollowingthedisc
随机试题
治疗肾盂肾炎湿热下注,应首选
A.阻断D1、D2受体B.使突触间隙的Na+浓度下降C.阻断N胆碱受体D.对心肌有奎尼丁样作用E.阻断中枢5-HT受体
确定应收账款评估值的基本公式是;应收账款评估值=()。
M公司与N公司均为增之势一般纳税人,适用的增值税税率为17%。M公司销售给N公司一批商品,价款200万元,增值税额34万元,款项尚未收到,因N公司资金困难,已无力偿还M公司的全部货款,经协商,N公司分别用一栋自用厂房和一项交易性金融资产予以抵偿。债务重组日
某国际连锁零售企业所有零售品均由供应商提供。近日,该企业打算在新开张的门店上架一批平板电视,第一批约需货品五百件。现有甲、乙、丙三家电视供应商可供选择。在选择供应商时,首先应调查的内容是()。
下列不属于明代四大声腔的有()。
网络虚拟社会是现实社会在计算机网络上的_____和延伸,现实社会中的违法犯罪以及社会治安问题已经开始向网络虚拟社会_____。大大增加了政府管理的复杂性。填入划横线部分最恰当的一项是:
根据以下资料,回答下列小题。央行2015年3月公布了2014年12月金融统计数据报告。具体如下:一、广义货币增长12.2%,狭义货币增长3.2%12月末,广义货币(M2)余额122.84万亿元,同比增长12.2%,增速分别比上
Studyingcarefullythecluesinthepassage,welearnthatthetotalpopulationofAfricais______.Thefigureofilliteracyi
Wheredidthethiefstealthecarsfrom?
最新回复
(
0
)