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
The space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particl
The space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particl
admin
2020-03-28
39
问题
The space between the stars is filled with matter that interstellar conditions should prevent from coalescing into solid particle. Yet surprisingly tiny frozen particles, referred to as interstellar grains, do develop in these spaces. These grains are formed out of chemical elements that are synthesized during thermonuclear fusion in stars and supernova explosions.
The study of interstellar grains has been hampered by the inaccessibility of naturally occurring specimens for use in laboratory experiments. To date, the only source of information about interstellar grains is the stellar electromagnetic radiation that reaches the Earth after passing through regions of space containing interstellar grains. By observing the wavelengths scattered and absorbed by the grains scientists have determined that a grain’s internal structure consists of a core composed of silicates (rocklike material) and a mantle composed entirely of organic compounds. It is hypothesized that each grain begins as a silicate “
seedling
” ejected from a mature star. Continuous physical and chemical evolution then occurs in the mantle formed around the seedling.
It can be inferred from the passage that the method currently used to analyze the structure of an interstellar grain could best be described is
选项
A、Unprecedented
B、Indirect
C、Comprehensive
D、Controversial
E、Unsound
答案
B
解析
根据第二段第一句可知,因为没法得到星际颗粒的标本,因此星际颗粒的研究方法都是间接的,选项B正确。
转载请注明原文地址:https://jikaoti.com/ti/EgLYFFFM
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
ManyUnitedStatescompanieshave,unfortunately,madethesearchforlegalprotectionfromimportcompetitionintoamajorline
Thefollowingquestionspresentasentence,partofwhichorallofwhichisunderlined.Beneaththesentenceyouwillfindfive
Thequestionsinthisgrouparebasedonthecontentofapassage.Afterreadingthepassage,choosethebestanswertoeachque
Itcanbearguedthatmuchconsumerdissatisfactionwithmarketingstrategiesarisesfromaninabilitytoaimadvertisingatonl
BetweentheeighthandeleventhcenturiesA.D.,theByzantineEmpirestagedanalmostunparalleledeconomicandculturalreviv
ManyUnitedStatescompanieshave,unfortunately,madethesearchforlegalprotectionfromimportcompetitionintoamajorline
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,someepidemicsarecausedbybacteriaandvirusesthat
Inchoosingamethodfordeterminingclimaticconditionsthatexistedinthepast,paleoclimatologistsinvokefourprincipalcri
Contrarytopopularopinion,themovementtowardaserviceeconomyisleadingneithertolowerstandardsofliving,moreofanu
随机试题
A、牙龈卟啉单胞菌B、黏性放线菌C、伴放线放线杆菌D、梭形杆菌E、中间型普氏菌与急性坏死性龈炎关系最为密切的致病菌是
甲公司于2月5日以普通信件向乙公司发出要约,要约中表示以2000元一吨的价格卖给乙公司某种型号钢材100吨,甲公司随即又发了一封快件给乙公司,表示原要约中的价格作废,现改为2100元一吨,其他条件不变。普通信件于2月8日到达,快信于2月7日到达,乙公司均已
下列关于中小企业私募债的说法,错误的是()。
将三盆同样的红花和四盆同样的黄花摆放成一排,要求三盆红花互不相邻,共有多少种不同的方法?()
阅读以下文字,完成下面问题。作为世界工业文明的肇始者,英国正在推进一场全方位的绿色文明革命,以减缓气候变化的脚步。天气是英国乐此不疲的恒久话题。然而,这一谈资延续至今,已经增加了新的内容,那就是全球性的气候变化。“气候变化已经成为英国百姓的热门话
You’veprobablybeenseeingandhearingalotmoreabout"eSports"lately.Majortelevisionnetworksarebroadcastingcompetitio
下列有关法律关系的说法不正确的是()。
下列情形构成无因管理的是()。
道德的功能,一般是指道德作为社会意识的特殊形式对于社会发展所具有的功效与能力。在道德的功能系统中,最基本的功能是()
方法一注意到[*]由洛必达法则得[*]方法二因为[*]所以xx一1=exlnx一1~xlnx,从而原式=1.
最新回复
(
0
)