首页
登录
职称英语
The space between the stars is filled with matter that interstellar conditio
The space between the stars is filled with matter that interstellar conditio
游客
2024-01-10
17
管理
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. [br] Which of the following describe a process that is most similar to the evolution of an interstellar grain, as it is described in the passage?
选项
A、An onion is peeled layer by layer
B、A piece of iron left outdoors is gradually corroded by rust
C、A balloon is inflated by being pumped full of air
D、A piece of wood is gradually carved down to the size of a chocolate
E、A candy is formed by coating a nut with successive layers of chocolate
答案
E
解析
根据文章最后三句所描述的星际颗粒的组成,星际颗粒是由一个硅酸盐核心+有机物外壳组成的,与之最类似的是选项B。A项描述的是变小的过程。B项干扰项,从corroded一词可知,该项描述的是一个变小的过程,但是原文的星际颗粒是变大的。C项尽管气球变大了,但是没有核心。D项描述的是变小的过程。
转载请注明原文地址:https://tihaiku.com/zcyy/3349717.html
相关试题推荐
Thestagewassetforsimmeringhostilitybetweenthetwosects,andthebreakdo
Realbodyfluids,likethosebetweenourceils,areless______thanthemodelflu
Agulfremainsbetweennegotiatorsfromtherichworld,whoaresoskepticalthe
Ratherthanallowingthesedramaticexchangesbetweenhercharacterstodevelop
Apersonwhoagreestoserveasmediatorbetweentwowarringfactionsatthereq
IntheUnitedStatesbetween1850and1880,thenumberoffarmerscontinuedtoi
Theconditionofscholarshipdevotedtothehistoryofwomeninphotographyisc
Theconditionofscholarshipdevotedtothehistoryofwomeninphotographyisc
Thewidelydocumented(i)______betweenthesetwodiseaseshaspromptedscientist
Becauseinsectcommunitiesserveasasortofbarometer,(i)______conditionsin
随机试题
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitu
[audioFiles]2018m3x/audio_ezfj_ezflisteningd_201803_061[/audioFiles]Guitar
Accordingtothepassage,themodernworldcanbedescribedasthefollowingEXC
以下对软件测试对象的叙述中,正确的是( )。A.只包括代码 B.包括代码、文
A.限制胆固醇摄入,中重度胆固醇小于200mg/d B.限制总能量、限制盐、补
A.清醒经口插管 B.清醒经鼻插管 C.静脉诱导后插管 D.吸入诱导后插管
治疗癥瘕气滞血瘀证,应首选( )。A.逐瘀止血汤 B.身痛逐瘀汤 C.生化
A.P选择素增高B.L选择素增高C.E选择素增高D.ICAM-1增高E.P选择素
《医疗事故处理条例》规定,造成患者轻度残疾、器官组织损伤导致一般功能障碍的属于A
(2018年真题)根据会计法律制度的规定,企业不相容职务应当相互分离。下列各项中
最新回复
(
0
)