首页
登录
职称英语
The Moon, which has undergone a distinct and complex geological history, pre
The Moon, which has undergone a distinct and complex geological history, pre
游客
2023-11-23
23
管理
问题
The Moon, which has undergone a distinct and complex geological history, presents a striking appearance. The moon may be divided into two major terrains: the maria (dark lowlands) and the terrace (bright high lands). The contrast in the reflectivity (the capability of reflecting light) of these two terrains suggested to many early observers that the two terrains might have different compositions, and this supposition was con firmed by missions to the Moon such as Surveyor and Apollo. One of the most obvious differences between the terrains is the smoothness of the maria in contrast to the roughness of the highlands. This roughness is mostly caused by the abundance of craters; the highlands are completely covered by large craters (greater than 40- 50km in diameter), while the craters of the maria tend to be much smaller. It is now known that the vast majority of the Moon’s craters Were formed by the impact of solid bodies with the lunar surface.
Most of the near side of the Moon was thoroughly mapped and studied from telescopic pictures years before the age of space exploration. Earth-based telescopes can resolve objects as small as a few hundred meters on the lunar surface. Close observation of craters, combined with the way the Moon diffusely reflects sunlight, led to the understanding that the Moon is covered by a surface layer, or regolith, that overlies the solid rock of the Moon. Telescopic images permitted the cataloging of a bewildering array of land forms. Craters were studied for clues to their origin; the large circular maria were mapper. Wispy marks on the surface (known as rays) emanating from certain craters were seen. Strange, sinuous features were observed in the maria. Although various land forms were catalogued, the majority of astronomers’ attention was fixed on craters and their origins.
Astronomers have known for a fairly long time that the shape of craters changes as they increase in size. Small craters with diameters of less than 10-15km have relatively simple shapes. They have rim crests that are elevated above the surrounding terrain, smooth, howl-shaped interiors, and depths that are about one-fifth to one-sixth their diameters. The complexity of shape increases for larger craters. [br] According to the passage, the maria differ from the terrace mainly in terms of ______.
选项
A、age
B、manner of creation
C、size
D、composition
答案
D
解析
细节理解题。由文章第一段前三句“... The contrast in the reflectivity (the capability of reflecting light) of these two terrains suggested to many early observers that the two terrains might have different compositions,and this supposition was confirmed by missions to the
转载请注明原文地址:https://tihaiku.com/zcyy/3213041.html
相关试题推荐
A、Theybothhavealonghistory.B、Theybothhaveagreatinfluenceonsociety.
A、Theenvironment.B、Academicwork.C、Commercialization.D、Localhistory.A细节归纳题
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
PassageThree[br]WhatdoesDenim’shistoryindicateaboutAmerica’sattitu
随机试题
Youknowyouhavetoread"betweenthelines"togetthemostoutofanythin
[originaltext]W:Everybodyistalkingaboutgenestoday,butdogenesdetermine
[originaltext]Thanksalotforyourhelp.[/originaltext][audioFiles]2017m5x/au
高应变法检桩时,应重锤低击,最大锤击落距不宜大于()米。A.2.5 B.
固定桥粘固后很快出现咬合时疼痛,首先要检查的是()A.有无咬合高点
患儿,8岁,流行性脑膜炎,痊愈出院。护士拟消毒病室空气(病室长5m,宽4m,高4
C左边5个图都是由相似的两个图形组成,且对称,所以第6个图形也应由相似的两个图形组成,选C。
前期物业管理的特点有()。A:管理服务呈现波动和不稳定状态B:经营收支一般呈现
关于商业银行销售理财产品,下列说法错误的是( )。A.应当遵循公平、公开、公正
可引起疾病暴发的是A.接触传播B.诊疗手术传播C.水和食物传播D.各种制剂传播E
最新回复
(
0
)