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 Ea
Scientists have long sought the reasons for the relatively young age of the majority of Martian meteorites discovered on Ea
admin
2009-05-19
65
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 exacerbated by the fact that the Martian rocks were ejected
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.
选项
A、presenting an argument to support a particular hypothesis
B、suggesting an answer to a theoretical question
C、questioning the assumptions of a research project
D、criticizing experimental results
E、explaining the origin of certain scientific data
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/jsjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Accordingtothepassage,AdamSmithwasthefirstpersonto______.AdamSmithsawthatthedivisionoflabor______.
Throughouthistory,humanshavesufferedfromaconditionthattheyhaveneverbeenabletoescape—ageing.Someresearchers,how
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytobethecauseofdefectsintheirunborninfantsasmo
Herpassionatevoicewasalwaysinfluentialand______.
MrObamawillgiveaspeechonthecurrentsituationatthemeeting_____nextweekinBeijing.
Theauthorusedthesoutherndialecttogivethestorysomelocal______.
DuringatriptoobservewildanimalsinAfrica,Iencounteredtheleastbraveanimalonearth,thewildebeest(角马).Isatona
Itwasonceassumedthatalllivingthingscouldbedividedintotwofundamentalandexhaustivecategories.Multicellularplants
PROBITY:
FLUENT:
随机试题
Jackisn’tgoodenough______figure,buthisoutstandingskillcompensatesforit.
患者女性,25岁。发现尿毒症2年,未进行系统治疗,2d前突然出现恶心、呕吐,神志淡漠,急检血气分析示:pH:7.20,实际碳酸氢盐为12mmol/L,此时应
A.偶氮偶联法B.酸碱指示剂法C.葡萄糖氧化酶法D.四甲替联苯胺法E.特异性酯酶法尿干化学Hb测定用
建筑内钢结构在高温条件下存在强度降低和蠕变现象,极易失去承载力。钢结构构件的防火保护措施主要有两种:其一采用砖石等无机耐火材料包覆;其二采用钢结构防火涂料。下列对建筑物钢结构防火检查要求中不正确的是()。
社会审计组织在办理审计机关的委托审计事项时,其审计结果()。
(2013年)2006年6月,梁某因交通肇事罪被判入狱服刑4年。2011年11月,因虚开普通发票罹被判处有期徒刑4年。下列有关梁某的刑罚适用及执行的说法中,正确的有()。
亮亮(10岁)在父母离婚后,跟随母亲一起生活,其父对亮亮可以不用尽教育义务。()
我国确认发明专利权的第一审行政案件应当由:
2009年1─10月份我国商品房销售面积总计66368.73万平方米,同比增长48.4%,总销售额为31529.12亿元,同比增长79.2%。分地区看,东部地区商品房销售面积为35190.87万平方米,同比增长56.3%,商品房销售额为21789
Thehealth-careeconomyisfilledwithunusualandevenuniqueeconomicrelationships.Oneoftheleastunderstoodinvolvesthe
最新回复
(
0
)