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
2010-03-19
42
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.
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。根据该词山现的上下文可知,“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/959K777K
0
专业英语四级
相关试题推荐
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletoputittouse.【C2】______,scientistsdiscoveredhowto
Ihadbeenpuzzledovertheproblemforoveranhourwithoutanyresultwhenallatoncethesolution______acrossmymind.
Itwas______thatwefelttiredwhenwearrived.
PresidentJimmygaveabrief_________ofthehistoryoftheuniversitybeforetheopeningoftheconference.
Aftersomanyweekswithoutrain,thegroundquickly______thelittlerainthatfelllastnight.
Modemadvertisingmentrytojustifywhattheydobytellingusoftheadvantagesofadvertising.Thus,itissaidthatadvertis
______Isympathize,Ican’treallydoverymuchtohelpthemoutofthedifficulties.
Themembershipcardentitledhim________certainprivilegesintheclub.
Duringthosedays,noone_______speakofthenameofhisgirlfriendinfrontofhim.
Thelittleboycameintotheroomafterplayingfootballfor2hours,hisface______withsweat.
随机试题
产品战略的选择方法通常有两种:_______和_______。
某男,70岁。患有冠心病10年。今天上午突然心痛剧作,面色青灰,冷汗淋漓,四肢厥冷,呼吸微弱,舌淡苔白润,脉微欲绝。临床诊断最可能的是
关于隐性感染,下列叙述哪项不正确
依照《中华人民共和国执业医师法》,卫生行政部门对医师活动的监督管理制度是
扩大客户量,提高交易量,(),在适当的时候提供恰当的信息,以增加客户或其朋友对销售人员的信任。
金融期货市场的首要功能是规避风险,它正是顺应这种需求才建立和发展起来的。( )
甲股份有限公司(下称“甲公司”)为上市公司,系增值税一般纳税人,销售商品适用的增值税税率为17%;适用所得税税率为25%,所得税采用资产负债表债务法核算,当年发生的可抵扣暂时性差异预计未来期间内能够转回,期初递延所得税资产、负债均无余额;按净利润的10%计
M企业2012年度的财务会计报告于2013年4月10日批准报出,2013年1月10日,因产品质量原因,客户将2012年12月10日购人的一大批大额商品(达到重要性要求)退回。因产品退回,下列说法中正确的是()。
3,一1,5,1,()
Mostpeoplehavetypewritersandcantypewellprefertotype【M1】______theirlettersnowadays.Therewasafeelingageneratio
最新回复
(
0
)