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 be divided
The Moon, which has undergone a distinct and complex geological history, presents a striking appearance. The moon may be divided
admin
2009-01-05
51
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.
The underlined word "undergone" in Line 1 is closest in meaning to ______.
选项
A、altered
B、substituted
C、experienced
D、preserved
答案
C
解析
词汇猜测题。根据该词出现的上下文可知,“undergone”是指月球经历了复杂的地质变化。因此,C为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/2SBK777K
0
专业英语四级
相关试题推荐
Thebookisdead.Technologyhaskilledit.Thelibrariesoftheworldaredoomingtobecomemuseums.Americans,however,【M1】___
Youcanperformallthosefunctionsthatyouperformatpresentwithyourmobiledevicesbutofmuchhigherspeedthan【M1】______
Fundingpublictransitisoneofthebiggestproblemsfacingcitiestoday.Oftenthetroubleisthatafewhigh-cost,low-rider
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchnarrowerlimitsmarktheboundariesofeffectivefunc
Thefollowingtwoexcerptsareaboutwhethermusiccontaininginappropriatelyricssuchasviolenceandpornographiccontentsho
Lastweekoilpricesfinallystoppedrising.Theynowhoveraround$43abarrel,a20-yearhigh.TheaverageAmericanfamilywil
TheIndiancoastalbelthasnotrecordedmanyTsunamisinthepast.Wavescompanyingearthquakeactivityhavebeenreportedover
Loveisromantic,thisisthecommontruthbelievedbymostpeoplewhohavenotmarried.But,marriagemeansacouplebindsinto
HARNESS JohnBirdwasbeinghailedasaspidermanherolastnight. John,afireman,leapedfromtheroofofa
随机试题
三维适形放射治疗的EPID技术目前主要用于
女性,24岁,新婚,突然有尿频、尿急、尿痛即来院就诊,尿蛋白微量、尿沉渣镜检白细胞多数。应如何处理
对罪犯在服刑期间发现漏罪及犯新罪的管辖错误的是:()
《测绘法》规定,批准全国统一的大地基准、高程基准、深度基准和重力基准数据的机构是()。
定量风险分析技术包括()。
中国公民张先生是某民营非上市公司的个人大股东,同时也是一位作家。2016年10月取得的部分实物或现金收入如下:(1)公司为其购买了一辆轿车并将车辆所有权办到其名下,该车购买价为35万元。经当地主管税务机关核定,公司在代扣个人所得税税款时允许税前减除的数额
根据我国《民法通则》,自然人取得完全民事行为能力的年龄是()周岁。
根据现行《宪法》规定,关于公民权利和自由,下列哪一选项是正确的?()
以下不属于ARM处理器的特点是()。
在下列模式中,能够给出数据库物理存储结构与物理存取方法的是
最新回复
(
0
)