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
The Moon, which has undergone a distinct and complex geological history, presents a striking appearance. The moon may
The Moon, which has undergone a distinct and complex geological history, presents a striking appearance. The moon may
admin
2004-12-30
103
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
(5) terrains might have different compositions, and this supposition was confirmed 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 40-50 km in diameter), while the craters
(10) 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
(15) 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
(20) 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 10-15 km have relatively
(25) simple shapes. They have rim crests that are elevated above the 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.
选项
A、What astronomers learned from the Surveyor and Apollo space missions
B、Characteristics of the major terrains of the Moon
C、The origin of the Moon’s craters
D、Techniques used to catalogue the Moon’s land forms
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/XO8O777K
0
托福(TOEFL)
相关试题推荐
AnswerthequestionsbelowusingNOMORETHANTHREEWORDSfromthepassageforeachanswer.Writeyouranswersinboxes22-26on
TheboxbelowgivesalistofresponsesA-PtothequestionnairediscussedinReadingPassage1.Answerthefollowingquestions
SomeofthecraftsmenandwomenemployedintherestorationofUpparkhavebenefitedbecause
InparagraphE,thewritersuggeststhatsomemuseumexhibits
AccordingtoWilkinson,studiesofinsectsontheislandcoulddemonstrate
ReadingPassage1hasnineparagraphslabelledA-I.Whichparagraphcontainsthefollowinginformation?Writethecorrectletter
MeasurestocombatinfectiousdiseaseintsaristRussiaAInthesecondhalfoftheseventeenthcentury,Russianauthoritiesbeg
Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.AverybriefhistoryoftimeTh
Usingdataisacomplexbusiness.Wellbeforeachampionship,sportsscientistsandcoachesstarttopreparetheathletebydeve
Usingdataisacomplexbusiness.Wellbeforeachampionship,sportsscientistsandcoachesstarttopreparetheathletebydeve
随机试题
简述常用的备货仓出版物的堆垛方法及其特点。
模具仿形铣削中最常用的是锥形球面铣刀。()
治疗湿痹拘挛,宜选用()(2008年第35题)
单核细胞也是一种_______,其功能是清除死亡或不健康的细胞,以及这些细胞破坏后的产物和微生物及其产物。
牙周袋病理形成始于()
组织兴奋性高低常用的简便指标是()
除……外,均为形成痿证的病理
预计到2020年我国旅游产业规模、质量、效益将达到世界旅游强国水平。()
(2016·河北)我国当前学制改革的主要内容包括()
设总体X服从韦布尔分布,密度函数为其中α>0为已知,θ>0是未知参数,试根据来自X的简单随机样本X1,X2,…,Xn,求θ的最大似然估计量.
最新回复
(
0
)