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
Scientists have long sought the reasons for the relatively young age of the majority of Martian meteorites discovered on
Scientists have long sought the reasons for the relatively young age of the majority of Martian meteorites discovered on
admin
2011-01-17
81
问题
Scientists have long sought the reasons for the relatively young age of the
majority of Martian meteorites discovered on Earth in comparison with the age
of Mars, an enigma exarcebated by the fact that the Martian rocks were ejected
Line by only six or seven separate impact events. Previous tests had predicted that
(5) driving meteorites to Earth would require a collision with an asteroid immense
enough to make a crater 12-kilometers across, but because such huge impacts
are extremely infrequent, it was unlikely that enough of them could have
occurred to explain our planet’s Martian meteorite collection.
Now astronomer James Head’s higher-resolution models demonstrate that
(10) collisions making craters only three kilometers across can jettison 10 million
fragments, each about 10 centimeters across, into space, a distribution
sufficient to cause some of them to be found on Earth. Sections of the planet
covered by debris (thus likely to be made up of older terrain) would require
larger and hence rarer impacts, and thus meteorites which reach Earth are
(15) predictably biased toward younger ages.
According to the passage, astronomers studying Martian meteors discovered on Earth were perplexed by them for which of the following reasons?
选项
A、The meteors found on Earth were too young to have originated from the impacts in question.
B、The meteors found on Earth were too old to be easily dated.
C、Not enough impact events have been recorded in recent history to explain how any young meteors would have reached the Earth.
D、Impacts on Mars have been so small that scientists question how any meteors have reached the earth.
E、The age distribution of meteors found on Earth was inexplicably based toward youth.
答案
E
解析
转载请注明原文地址:https://kaotiyun.com/show/O1jO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
ResearchersinBritainaretellingschoolsthatchildrenshouldbedoingmorelearningoutdoors.Theresearcherssaythereiscu
Themind-successconnectionisstrong,andmanyobstaclestooursuccessarealsomental.Somepeoplerelymoreonfacts,【C1】__
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartianlifeexistedinthepast—orstillexists.【C1】______
Customer:Excuseme,weorderedacokewithouticeinsteadofthisicedcoke.Waiter:I’msorry.______
Asabusinesswoman,Icaredeeplyaboutmycustomers.Butlikeanyoneforwhomyoufeelaffection,【C1】________canalsodriveyou
Therearefivecardsmarked1,2,3,4,5inabox.Ifthesumoftwocardswhicharetakenfromthosecardsrandomly(noreplac
Politician:Unlessournationredistributeswealth,wewillbeunabletoalleviateeconomicinjusticeandourcurrentsystemwil
A、thrivingbutthreatenedB、securebutinertC、moribundbutrecoveringD、penuriousandinneedofhelpE、salubriousbutunpredic
INCURSION:
MOROSE:
随机试题
急性脓胸经胸穿刺后,脓汁又迅速增多,其适当的治疗方法,是
妄想是
刑事责任的变迁。
在存货经济订货量模型中,导致经济订货量增加的因素有()。
2000年之前,我国中央和地方共享证券交易印花税的比例是()。
教师职业道德的核心是()
当一物之上同时存在抵押权、质权和留置权时,权利的行使顺序是()。
“自由想象力崇拜”的背后,是“顿悟崇拜”。这种思想认为一般人终日被自己的知识所___________,而一旦跳出就能取得重大突破。费曼说,相对论流行以后,很多哲学家跳出来说:“坐标是相对的,这难道不是最自然的哲学要求吗?这个我们早就知道了!”可是如果你告诉
下列各嵌入式操作系统中,公开源码的是()。
Jackworkedashardashecould______upwiththeothers.
最新回复
(
0
)