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
79
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
Themind-successconnectionisstrong,andmanyobstaclestooursuccessarealsomental.Somepeoplerelymoreonfacts,【C1】__
NocountryintheworldhasmoredailynewspapersthantheUSA.Therearealmost2,000ofthem,ascomparedwith180inJapan,
Todayanyonewillacceptmoneyinexchangeforgoodsandservices.Peopleusemoneytobuyfood,furniture,books,bicyclesand
Thebirthrateinacity______tofallasitsgrossdomesticproduct(GDP)risessteadily.
Computertechnologyisadvancingsofastthatoldhardwarequicklybecomescompletelyobsolete.Theelectronicwaster(e-waste)
Asabusinesswoman,Icaredeeplyaboutmycustomers.Butlikeanyoneforwhomyoufeelaffection,【C1】________canalsodriveyou
Technologyhasbeenanencouragementofhistoricalchange.ItactedassuchaforceinEnglandbeginningintheeighteenthcentu
A、thrivingbutthreatenedB、securebutinertC、moribundbutrecoveringD、penuriousandinneedofhelpE、salubriousbutunpredic
ACT:IMPROVISE::
ARTICULATE:SPEECH::
随机试题
支气管哮喘概念的描述恰当的是
指阴寒之邪壅盛于内,逼迫阳气浮越于外。使阴阳之气不相顺接,相互格拒的一种病理状态
在资金成本中,具有产品成本性质的部分应计人产品成本,另一部分应作为()。
(2008年考试真题)利率期限结构的形成主要是由对未来利率变化方向的预期决定的,流动性溢价和市场分割可起一定作用。()
单位定期存款在存期内按存入日挂牌公告的定期存款利率计付利息,遇利率调整,不分段计息。单位定期存款到期不取,逾期部分按支取日挂牌公告的活期存款利率计付利息。()
1万元贷款,年利率是10%,用复利计算,只要经过7.2年,原先的1万元贷款就变成了2万元,再经过7.2年,就会变成()万元。
发展适宜性原则有两个方面的涵义,即年龄适宜性和()。
【2016天津静海】品德态度的形成包括以下阶段()。
设f(x)在[一a,a](a>0)上有四阶连续的导数,存在.写出f(x)的带拉格朗日余项的麦克劳林公式。
下列产品不适合采用基于功能的集成测试策略的是______。
最新回复
(
0
)