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
2023-11-22
43
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] 【C18】
选项
A、increase
B、decline
C、fading
D、moderating
答案
B
解析
前后文理解。
转载请注明原文地址:https://tihaiku.com/zcyy/3209062.html
相关试题推荐
(1)ScientistssayChandraprovidesfirstevidencethattwomysteriescancoe
(1)ScientistssayChandraprovidesfirstevidencethattwomysteriescancoe
(1)ScientistssayChandraprovidesfirstevidencethattwomysteriescancoe
(1)ScientistssayChandraprovidesfirstevidencethattwomysteriescancoe
PASSAGETHREE[br]WhoprovidesthehardevidencethatMarswasonceawetplane
PASSAGEONE[br]WhatevidenceisgiveninPara.8toindicateJews’wealth?The
[originaltext]I:Havetheygotanyconclusionastohowpeopleshouldinteract
[originaltext]I:Havetheygotanyconclusionastohowpeopleshouldinteract
[originaltext]I:Havetheygotanyconclusionastohowpeopleshouldinteract
PassageTwoWhatconclusionmightbedrawnaboutthecurrentmodelsonmalar
随机试题
[originaltext]Whatcolordoyoulike?[/originaltext][audioFiles]2021m12x/audio
Themomentumisbuildingaheadofnextmonth’sG8summitinScotlandwheret
It’sa(47)______oftenrequestedinlonelyheartsadsandscientistshaven
采用工程量清单计价,建设工程造价由下列何者组成?Ⅰ.分部分项工程费;Ⅱ.措施项目
下列关于食品添加剂的说法,错误的是A.食品添加剂应当有标签、说明书和包装 B.
()能使教师及时了解学生在该阶段的音乐学习情况,及时反馈教学信息,发现学生音
A.朱砂B.石菖蒲C.柏子仁D.合欢皮E.首乌藤有疏肝解郁、宁心安神功效的药物是
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
单位支取定期存款只能以转账方式将存款转入其()账户。A.一般存款
关于无效合同,说法正确的是()。A.造成对方人身伤害的免责条款无效 B.
最新回复
(
0
)