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
58
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] The passage probably continues with a discussion of ______.
选项
A、the reasons craters are difficult to study
B、the different shapes
C、some features of large craters
D、some difference in the ways small and large craters were formed
答案
C
解析
推理题。由文章第三段最后一句“The complexity of shape increases for larger craters.”可知,下文将谈到大型弹坑的特点。因此,C选项为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3213043.html
相关试题推荐
A、Theybothhavealonghistory.B、Theybothhaveagreatinfluenceonsociety.
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】_____
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____
PassageThree[br]WhatdoesDenim’shistoryindicateaboutAmerica’sattitu
随机试题
______travelingexpensesrisingalot,Mm.Whitehadtochangeallhexplansfo
Lessthanayearago,anewgenerationofdietpillsseemedtoofferthelon
通过音乐教学评价,可以发现教学中存在的问题,并找出问题的原因,这体现了音乐教学评
患者头重如裹,胸闷脘痞,口腻不渴,纳谷不香,甚至恶心欲呕,肢困嗜睡的临床意义是(
金黄色葡萄球菌的致病物质不包括A:凝固酶B:葡萄球菌溶素C:肠毒素D:表皮
对于有限空间作业,必须严格执行作业审批制度,有限空间作业的现场负责人、监护人员、
运维班负责的带电检测项目包括:一、二次设备红外热成像检测、开关柜地电波检测、变压
土地用途管制的核心是()。A.土地的国有化 B.土地的经济价值
卡尔·马克思说:“法官是法律世界的国王,法官除了法律没有别的上司。”对于这句话,
涂料由主要成膜物质、次要成膜物质和辅助成膜物质组成。下列材料属于辅助成膜物质的是
最新回复
(
0
)