首页
登录
职称英语
Astronomers who study planet formation once believed that comets—because the
Astronomers who study planet formation once believed that comets—because the
游客
2024-01-10
26
管理
问题
Astronomers who study planet formation once believed that comets—because they remain mostly in the distant Oort cloud, where temperatures are close to absolute zero—must be pristine relics of the material that formed the outer planets. The conceptual shift away from seeing comets as pristine relics began in the 1970s, when laboratory simulations revealed there was sufficient ultraviolet radiation reaching comets to darken their surfaces and there were sufficient cosmic rays to alter chemical bonds or even molecular structure near the surface. Nevertheless, astronomers still believed that when a comet approached the Sun—where they could study it—the Sun’s intense heat would remove the corrupted surface layer, exposing the interior. About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve. [br] The author suggests that the realization described in the final sentence of the passage had which of the following effects?
选项
A、It introduced a new topic for study by astronomers interested in planetary formation.
B、It led astronomers to adopt a number of different strategies in trying to determine the composition of cometary interiors.
C、It called into question an assumption that astronomers had made about comets.
D、It cast doubt on astronomers’ ability to study the interior parts of comets.
E、It caused astronomers to revise their account of the composition of the outer planets.
答案
C
解析
本题属于功能题,正确答案是定位句3s版本。由最后一句的句间关系可知,该句的功能在于反驳前一句,因此选项C正确。A项无关选项。B项无关选项。D项最后一句反驳的是前一句天文学家的观点,而非天文学家的能力。E项最后一句只是反驳了天文学家的观点,没有使天文学家修正自己的观点。另外,文章讨论的是彗星是否纯洁,这和外部行星的组成无关。
转载请注明原文地址:https://tihaiku.com/zcyy/3349654.html
相关试题推荐
Becausetheemployee’smotiveswerefoundtobe______,nodisciplinaryactionwi
Becauseofhis______,Brian’sguestsfeltverywelcomeandcomfortablestayinga
Sendingarobotintospacetogatherinformationisaviableoption,butshould
Sendingarobotintospacetogatherinformationisaviableoption,butshould
Sendingarobotintospacetogatherinformationisaviableoption,butshould
AstronomersfoundalargebodyorbitingclosetothestarUpsilonAndromedae.Th
Willsarguesthatcertainmalarialparasitesareespecially(i)______becausethey
Giventhefloodofinformationpresentedbythemassmedia,theonlywayforsom
AlthoughcosmicobjectshavestruckEarthsincetheplanet’sveryformation,hum
Instantcelebrityisoften(i)______assetbecauseifthereisno(ii)______tointe
随机试题
In1810Gallpublishedtheneuroanatomist’smanualAnatomie,correla
[originaltext]Requestingsomeone’sbusinesscardisastraightforwardproce
________,whowereFrench-speaking,achievedthefinalunificationofEngland.A、
患者,女性,48岁,8月初由外地来京探亲,因“发热、头痛5天,神志不清2天”于9
下列选项,不属于器乐作品的是。( )A.独奏 B.重奏 C.重唱 D.合
根据企业风险管理基本框架八个方面的内容,基金管理人要求公司基金经理与特定资产管理
共用题干 TheGreatNewspaperWarUpuntilab
材料二:2018年上半年,我国经常账户逆差1801亿元,资本和金融账户顺差424
(2018年真题)下列各项中,应通过管理费用核算的是( )。A.预计产品质量保
苯丙酮尿症(PKU)的遗传方式是A.常染色体隐性遗传 B.X-连锁显性遗传
最新回复
(
0
)