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
95
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
Lookatthefollowingdiagrams(Questions30-32),andthelistoftypesofmovementbelow.Matcheachdiagramtothetypeofmove
AnswerthequestionsbelowusingNOMORETHANTHREEWORDSfromthepassageforeachanswer.Writeyouranswersinboxes22-26on
Adultsandchildrenarefrequendyconfrontedwithstatementsaboutthealarmingrateoflossoftropicalrainforests.Forexampl
Lookatthefollowingfindings(Questions20-23)andthelistofresearchersbelow.Matcheachfindingwiththecorrectresearch
Accordingtothewriter,themostsignificantthingabouttortoisesisthat
MeasurestocombatinfectiousdiseaseintsaristRussiaAInthesecondhalfoftheseventeenthcentury,Russianauthoritiesbeg
TheHistoryoftheGuitarTheword’guitar’wasbroughtintoEnglishasanadaptationoftheSpanishword’guitarra,’whichwas,
HowdesertsareformedA.Adesertreferstoabarrensectionofland,mainlyinaridandsemi-aridareas,wherethereisal
PrairieDogbarkshave______meanings.PrairieDogsareabletoinvent______forthingstheyhaveneverseenbefore.
TicktheTHREEotheritemswhicharementionedinthenewsheadlines.
随机试题
属于抗过敏的兽用处方药是
被艺术家们评价为“中国社会和历史文化的一面镜子”的作品是()
Weneedtoconsiderwhat______wewillbeusingforlanguagetraining.
慢性硬膜下血肿有以下特点,但除外
对急性大面积或多灶性糜烂型扁平苔藓的肾上腺皮质激素治疗应采用
操纵证券市场的手段主要包括()
经营者提供商品或者服务有欺诈行为,应当按照消费者要求增加赔偿其受到的损失。增加赔偿的金额为消费者购买商品的价格或者接受服务的费用的()。
研究性学习是“综合实践活动”板块中的一个重要组成部分,它综合了()的优势,对培养学生的问题解决能力、创造性思维大有裨益。
行政组织作为管理社会公共事务的机构,其设计原则既要遵循一般组织设计的原则,又有着自己特殊的要求。下列不属于行政组织设计的原则是()。
姿势反射包括
最新回复
(
0
)