首页
登录
职称英语
[originaltext] We are going to talk today about the moon, our moon. First of
[originaltext] We are going to talk today about the moon, our moon. First of
游客
2023-08-15
10
管理
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://tihaiku.com/zcyy/2926868.html
相关试题推荐
[originaltext]ThenumberofspeakersofEnglishinShakespeare’stimeises
[originaltext]W:Mr.Stern,mayIaskyou?Doyouthinkitwasnecessaryandfa
[originaltext]W:Mr.Stern,mayIaskyou?Doyouthinkitwasnecessaryandfa
[originaltext]W:Goodeveningandwelcometotonight’seditionofLegendaryLiv
[originaltext]Untilrecently,blindandvisuallyimpairedstudentsinKenya
[originaltext]Untilrecently,blindandvisuallyimpairedstudentsinKenya
[originaltext]Untilrecently,blindandvisuallyimpairedstudentsinKenya
[originaltext]Manypeoplewhodrinkalcoholalsoliketosmokecigarettes.
[originaltext]Manypeoplewhodrinkalcoholalsoliketosmokecigarettes.
[originaltext]Manypeoplewhodrinkalcoholalsoliketosmokecigarettes.
随机试题
[originaltext]Itisveryselfevidentthatthegeographicallocationofac
Politiciansbeware.Softwarecanexaminelegislativebills,workingoutthe【
导游服务的作用包括()。A.纽带作用 B.标志作用 C.信息反馈作用 D.
作为市场风险的重要计量和分析方法,久期分析通常用来衡量商业银行的经济价值对利率变
患儿,男,3岁。因咳嗽3天、喘憋1天入院。查体:体温38.6℃,脉搏120次/分
下列各项属于集体资产的是( )。 A.农户承包经营的土地 B.家庭生
某三角形木桁架的上弦杆和下弦杆在支座节点处采用单齿连接,节点连接如题图所示。齿连
对于35kV及以下电缆,下列哪些项敷设方式符合规定?()A.地下电缆与公路交叉
智商同为85,其一是山区农民,结合他受教育程度和所处环境,考虑其智力基本正常;其
会计凭证方面,科目汇总表账务处理程序比记账凭证账务处理程序增设了()。A.原始
最新回复
(
0
)