首页
登录
职称英语
Scientists have long sought the reasons for the relatively young age of
Scientists have long sought the reasons for the relatively young age of
游客
2024-01-11
40
管理
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://tihaiku.com/zcyy/3354246.html
相关试题推荐
Scientistssayitmaybefiveorsixyears_____thismedicineistestedonhuma
______relativelycostly,theengineishighlyefficientandneedsservicinginfr
ScientistsAhavelongBstrugglewithhowtomeasuretheCeffectsofclimatechan
Tothescientists’delight,theireffortshaveincreasedpeople’s___________oft
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Somesoilscientistshaveassertedthatdecayingmatterontheforestfloorisa
Becausedinosaurswerereptiles,scientistsonceassumedthat,likeallreptiles
ThefirstpeopletoinhabitNorthAmericacamefromAsia.Scientistshadhypothe
随机试题
[originaltext]Whatisthebestwaytolearnalanguage?Weshouldremember
EarlyinthefilmABeautifulMind,the【C1】________JohnNashisseensittin
[originaltext]W:Bob,doyouknowwhoIsawtheotherday?OldJake,lookingte
绝经后妇女除恶性肿瘤外,出现血性白带最可能的是A.子宫肌瘤 B.滴虫性阴道炎
2010年排名第二的海洋产业增加值比倒数第一的产业多()倍。 A.174
有一串彩旗,▼代表蓝色,▽代表黄色。两种彩旗排成一行如下所示: ▽▼▽▼▼▽▼
教学方法是教师上课的方法,是教师为完成教学任务而采用的方法。()
工程计量时,监理人应当予以计量的工程量有()。A.承包人超出设计图纸和设计文件
采用装运港船上交货价时卖方的责任有( )等。A.负责租船或订舱 B.负责办理
缺铁性贫血最常见的病因是 A.慢性胃炎 B.慢性肝炎 C.慢性溶血
最新回复
(
0
)