首页
登录
职称英语
共用题干 Dark Forces Dominate UniverseThe e
共用题干 Dark Forces Dominate UniverseThe e
免费题库
2022-08-02
15
问题
共用题干Dark Forces Dominate Universe
The earth,moon,sun and all visible stars in the sky make up less than one percent of
the universe.Almost all the rest is dark matter and dark energy,unknown forces that
_______(1)astronomers.
Observations in recent years have changed the basic_______(2)of how the
universe evolved and have indicated how little is known about the major forces and
substances that_______(3)our world.
Astronomers now know that luminous(发光的)matter一stars , planets and hot gas一
accounts_______(4)only about 0.4 percent of the universe.Non-luminous
components , such as black holes and intergalactic(星系间的)gas,_______(5)
up 3.6 percent.The rest is either dark matter,about 23 percent,or dark energy,about
73 percent.
Dark matter,sometimes_______(6)"cold dark matter,"has been known for some time.Only recently have researchers come to understand the key role it_______ (7)in the formation of stars,planets and even people.
"We_______(8)our very existence to dark matter,"said physicist Paul
Steinhardt and a co-author of a review on dark matter which_______(9)not long ago
in the journal Science.
"Dark matter dominated the structure_______(10)in the early universe,"
Steinhardt said."For the first few billion years dark matter contained most of the mass of the
universe. You can think of ordinary matter_______(11)a froth(泡沫)of an ocean
of dark matter. The dark matter clumps(结成块)and the ordinary matter falls into it. That
_______(12) to the formation of the stars and galaxies(星系)."
Without dark matter,"there would be virtually no structures in the universe,"
The nature of dark matter is_______(13).It cannot be seen or detected
directly. Astronomers know it is there because of its_______(14) on celestial(天体
的)objects that can be seen and measured.
But the most dominating force of all in the universe is called dark energy,a recently
________(15)power that astronomers say is causing the galaxies in the universe to
separate at a faster and faster speed._________(12) A:turned B:worked C:led D:attempted
选项
_________(12)
A:turned
B:worked
C:led
D:attempted
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/1492035.html
本试题收录于:
理工B题库理工类分类
理工B
理工类
相关试题推荐
共用题干 第三篇OperationMigrationIfyoulook
共用题干 第三篇OperationMigrationIfyoulook
共用题干 第三篇OperationMigrationIfyoulook
共用题干 第二篇“Lucky"LordLucan一AliveorDea
共用题干 第二篇“Lucky"LordLucan一AliveorDea
共用题干 第一篇OntheTrailoftheHoneyBadge
共用题干 第一篇OntheTrailoftheHoneyBadge
共用题干 第一篇OntheTrailoftheHoneyBadge
共用题干 第一篇OntheTrailoftheHoneyBadge
共用题干 TrafficJams一NoEndinSight1Traf
随机试题
Fortunately,thedemonstration______tobequitepeaceful.A、turnedinB、turned
[originaltext]W:Goodmorning,canIhelpyou?M:Yes,I’mStoneWilliams.I’ve
AreBadEconomicTimesGoodforHealth?A)Mostpeopleareworri
数字出版平台是以产品制作和用户服务为目标,建立起( )的协同工作机制。A.内容
关于乳母营养,以下陈述不科学的是( )。A.食物种类齐全,品种多样 B.
“方案教学”的倡导者是( )A.瑞吉欧学前教育理论流派 B.进步主义学前教育理
功效为疏肝解郁,调经止痛的中药是A.荔枝核 B.木香 C.香附 D.
可见光及紫外光分光光度法常用的定量方法不包括A:标准曲线法B:对比法C:摩尔
一般资料:求助者,女性,36岁,无固定职业。 案例介绍:求助者因与女儿发生矛盾
下列有关国家对传染病防治的方针与办法最恰当的提法是A.预防为主、防治结合、统一管
最新回复
(
0
)