首页
登录
职称英语
The Moon, which has undergone a distinct and complex geological history, pr
The Moon, which has undergone a distinct and complex geological history, pr
游客
2024-10-25
1
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 highlands). 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 4050km 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 lO-15km have relatively simple shapes. They have rim crests that are elevated above tile surrounding terrain, smooth, bowl-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/3816576.html
相关试题推荐
Whydoesthespeakerthinksomestudentsdon’tlikehistory?[br][originaltext
TheMoon,whichhasundergoneadistinctandcomplexgeologicalhistory,pr
TheMoon,whichhasundergoneadistinctandcomplexgeologicalhistory,pr
Hetriedto______totheviewofthepublicmoredistinctlythaniscommonlydo
Whatistheeasiestwaytoshowthecomplexhierarchyofanewspaper?[br][ori
Whatistheeasiestwaytoshowthecomplexhierarchyofanewspaper?[br][ori
Whatistheeasiestwaytoshowthecomplexhierarchyofanewspaper?[originalt
Thissemester,thecoursesWilliamshastakenareHistory,Mathematics,Chemistr
Inmanyculturespeoplemakeadistinctionbetweenfineartandfolkart.A
Inmanyculturespeoplemakeadistinctionbetweenfineartandfolkart.A
随机试题
[originaltext]Paces,likefingerprints,areunique.Didyoueverwonderhow
Thepovertylineistheminimumincomethatpeopleneedforanacceptablest
SINFULNESS:PECCADILLO::A、depravity:distortionB、solicitude:apprehensionC、p
[originaltext]W:Doyouthinkdreamspredictthefuture?Ihadadreamlastnig
初中生物《合理营养与食品安全》 一、考题回顾 二、考题解析
患儿,10岁,发热2天伴水样腹泻2次,2小时前突然感胸闷不适、腹痛、烦躁不安,晕
商业银行发行的()是指本金和利息的清偿顺序列于商业银行其他负债之后、先于商业银行
房地产经纪人张某、李某共同发起设立了一家合伙制房地产经纪机构(以下简称甲机构),
消弧线圈验收细则规定,消弧线圈关键点见证时,关于器身干燥说法正确的(____)。
信用贷款是指凭借款人的人格发放的贷款。()
最新回复
(
0
)