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
Dark Forces Dominate Universe The Earth, moon, sun and all visible stars in the sky make up less than one percent of the uni
Dark Forces Dominate Universe The Earth, moon, sun and all visible stars in the sky make up less than one percent of the uni
admin
2009-06-15
23
问题
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(1)that puzzle astronomers. Observations in recent years have changed the basic understanding of how the universe evolved and have emphasized for astronomers how little is known(2)the major forces and substances that shaped our world. Astronomers now know that luminous matter-stars, planets and hot gas —(3)only about 0.4 percent of the universe. Non. luminous components, such as black holes and intergalactic gas, make up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent. Dark matter, sometimes called "cold dark matter" has been known for some(4). Only recently have researchers come to understand the pivotal role it(5)in the formation of stars, planets and even people. "We owe our very existence to dark matter," said physicist Paul Steinhardt and a co-author of a review on dark matter which appeared not long(6)in the journal Science. Steinhardt said it is believed that following the Big Bang, the theoretical(7)of the universe, dark matter caused particles to clump together. That set up the gravitation processes that led to the formation of stars and galaxies. Those stars, in turn, created the basic chemicals, such as carbon and iron, that were(8)to the evolution of life. "Dark matter dominated the formation of structure in the early universe." Steinhardt said. "For the first few billion years dark matter contained(9)of the mass of the universe. You can think of ordinary matter as a froth of an Ocean of dark matter. The dark matter clumps and the ordinary matter falls into it. That led to the(10)of the stars and galaxies." Without dark matter, "there(11)be virtually no structures in the universe." The nature of dark matter is(12). It cannot be seen or detected(13). Astronomers know it is there because of its effect on celestial objects than can be seen and measured. But the most dominating force of(14)in the universe is called dark energy, a i:ecently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed. One scientist said it is clear now(15)dark matter and dark energy engaged in a gravitational tug of war that. eventually, dark energy won. intergalactic adj. 银河间 pivotal adj.关键的 owe v. 把……归功于 clump v.凝聚成块 gravitation n.地心吸力,万有引力 froth n.泡沫 celestial adj.天体的
选项
A、universal
B、additional
C、fundamental
D、structural
答案
C
解析
从意义上判断,本题填的应该是important,fundamental,necessary之类的形容词。
转载请注明原文地址:https://kaotiyun.com/show/0VQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
LifeintheUniverseManyscientiststodayareconvincedthatlifeexistselsewhereintheuniverse-lifeprobablymuchlike
LifeintheUniverseManyscientiststodayareconvincedthatlifeexistselsewhereintheuniverse-lifeprobablymuchlike
LifeintheUniverseManyscientiststodayareconvincedthatlifeexistselsewhereintheuniverse-lifeprobablymuchlike
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
LungCancer1Thedeathrateduetocancerofthelungshasincreasedmorethan800percentinmalesandhasmorethandoubl
随机试题
WindowsServer2003安装完后,会预设两个账户:( )和Administrator。
癫痫强直—阵挛发作时最主要的护理是
扩张型心肌病并发充血性心力衰竭患者,症状出现后的5年生存率为
工程竣工验收备案应在建设工程竣工验收合格之日起()个工作日内,向建设行政主管部门备案。
2005年8月15日,甲公司销售一批商品给乙公司,开出的增值税专用发票上注明的销售价款为400000元,增值税额为68000元,款项尚未收到。2005年12月1日,甲公司与某银行协商后约定:甲公司将应收乙公司的上述债权出售给该银行,价款为382200元,在
甲公司设有运输和修理两个辅助生产车间,运输车间的成本按运输公里比例分配,修理车间的成本按修理工时比例分配。该公司2020年2月运输车间共发生成本22500元,提供运输劳务5000公里,其中修理车间耗用运输车间劳务500公里;修理车间本月共发生成本24000
他________在色彩与线条的世界中,一个星期没有离开过设计室,终于出色地完成了任务。填入横线部分最恰当的一项是()
建立在理解人、体贴人基础上的富有人情味的导游服务是()。
2015年,我国海洋灾害以风暴潮、海浪、海冰和赤潮灾害为主,绿潮、海岸侵蚀、海水入侵与土壤盐渍化、咸潮入侵等灾害也均有不同程度发生。各类海洋灾害造成直接经济损失72.74亿元,死亡(含失踪)30人。2014年7月,在我国华南沿海登陆的1409“威马逊”台风
Shortstoriesareduearevival.Inrecentyears,therehavebeencritically【C1】______collectionsbyAmericanwriterssuchasLy
最新回复
(
0
)