首页
登录
职称英语
Mounting evidence has led astronomers to just an improbable conclusion; At
Mounting evidence has led astronomers to just an improbable conclusion; At
游客
2024-10-30
27
管理
问题
Mounting evidence has led astronomers to just an improbable conclusion; At least 90 percent and possibly 99 percent of all matter in the universe is completely【C1】______ . Astronomers call this stuff dark matter.
An astronomer first reported the matter after noting some unusual behaviour in visible matter. In 1993, Swiss astrophysicist Fritz Zwicky concluded that 【C2】______ was causing strange gravitational effects【C3】______ these galaxies.
Galaxies are like【C4】______ islands in deep space【C5】______ billions of stars that are held together by the force of【C7】______ .Some galaxies are part of【C6】______ systems called clusters; which contain many galaxies. Most galaxies; belong to smaller systems called groups. Groups and clusters in 【C8】______ form even larger【C9】______ known as super-clusters. Just【C10】______ the force of gravity keeps stars together in galaxies the force of gravity【C11】______to keep galaxies together in clusters~
This same force of gravity keeps planets【C12】______ around the sun【C13】______ flying off into space. How great a force gravity exerts depends on the mass of the objects【C14】______ and the distance between them, a【C15】______ discovered by Newton. The amount of mass and the distance between objects also【C16】______ how fast the objects travel as they orbit each other. The force of its gravity keeps Earth and the other planets【C17】______ orbit around it. The orbital speeds of the planets【C18】______ with increasing distance from the sun. The planet nearest to the sun travels at an orbital speed of 48 kilometers per second【C19】______ the distant planet Pluto orbits【C20】______ speed of 7 kilometers per second [br] 【C16】
选项
A、tell
B、measure
C、determine
D、expose
答案
B
解析
决定。
转载请注明原文地址:https://tihaiku.com/zcyy/3823628.html
相关试题推荐
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
Mountingevidencehasledastronomerstojustanimprobableconclusion;At
随机试题
Whichofthefollowingisthemostappropriatetitleforthispassage?[br]Beca
Dogswerefirstdomesticatedfromwolvesatleast17,000yearsago,butperh
[originaltext]W:Goodafternoon,sir.AnythingIcandoforyou?M:Yes,I’dli
Haiti’sTourismA)LikemanyofitsCaribbeanneighb
患者,男性,45岁。上腹间歇性疼痛2年。多于夜间发作,进食后疼痛可缓解。突发上腹
资产负债表是反映企业在某-特定日期()的报表。A、财务状况 B、现金流量 C
对股票规模的划分并不严格,依据相对规模进行划分,将全部上市公司按市值大小排名并累
下列关于四种市场推广方式优缺点比较的表述中,正确的是( )。A:人员推广易引起
会计的基本职能有会计核算和()。A.资源配置 B.会计监督 C.会计决
直接形式的薪酬不包括()A:基本工资 B:绩效工资 C:额外津贴 D
最新回复
(
0
)