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
考研
The U.S. space agency, NASA, is planning to launch a satellite that scientists hope will answer fundamental questions about the
The U.S. space agency, NASA, is planning to launch a satellite that scientists hope will answer fundamental questions about the
admin
2017-10-23
67
问题
The U.S. space agency, NASA, is planning to launch a satellite that scientists hope will answer fundamental questions about the origin and destiny of our universe.
【C1】______
The prevailing theory of the universe’s origin, the "Big Bang" theory, says all matter and energy were once compressed into a tiny point. The density and resulting temperature were so enormous that, about 13-to-15-billion years ago by current estimates, a mighty explosion flung the matter hurtling outward in all directions.
【C2】______. They also ask, is the expansion accelerating? Will the universe collapse? What is its shape? Scientists will seek explanations with NASA’s new Microwave Anisotropy Probe, abbreviated as MAP.【C3】______. "MAP will take the ultimate baby picture, an image of the infant universe taken in the fossil light that is still present from the Big Bang," he says. "This glow, this radiation, is the oldest light in the universe. Imprinted on this background, physicists knew, would be the secrets of the Big Bang itself."
This background radiation is the light and heat that the early cosmic soup of matter emitted. Once roiling hot, it has cooled over the eons to just a few degrees above absolute zero. It was once thought to be distributed evenly. But in 1992, a highly sensitive NASA satellite named COBE detected nearly imperceptible variations in temperature as tiny as 30-millionths of a degree.
【C4】______. "These patterns result from tiny concentrations that were in the very early universe that were the seeds that grew to become the stars and the galaxies that we see today," he says. "The tiny patterns in the light hold the keys for understanding the history, the content, the shape, and the ultimate fate of our universe. "
【C5】______. Princeton University scientist David Spergel says MAP will give us a much more accurate matter count than we have now. "Right now, we want to measure something like the matter-density of the universe," he says. "Today, we can estimate that to a factor of two. That’s pretty good. What we want to do is be able to measure it to about the three-percent level, which is what MAP will be capable of doing. "
To do its job, the $ 145 million MAP spacecraft will settle into an orbit 1.5 million kilometers from the Earth. This is where the Earth’s and Sun’s gravitational pull are equal, and well past the range of the Earth’s own obscuring microwave radiation.
While the older COBE satellite measured just a small part of the sky, Chalrles Bennett says MAP will scan the entire sky at 1,000 times better resolution. "The patterns that MAP measures are extremely difficult to measure," he says, "MAP will be measuring millionths of a degree temperature accuracies, and that’s hard to do. That’s like measuring the difference between two cups of sand to the accuracy of a single grain of sand."
[A] Scientists are trying to learn how it clumped together to produce stars, clusters of stars called galaxies, and clusters of galaxies.
[B] Astronomers are reporting evidence that points to a massive star-eating black hole at the center of our Milky Way galaxy.
[C] One of those keys is the amount of matter and its density. More matter with a higher density means more mole gravitational pull, suggesting a slowing of the universe’s expansion, and perhaps even its collapse.
[D] The head of NASA’s Evolution of the Universe program, Alan Bunner, says MAP will measure what is thought a remnant of the Big Bang—an afterglow of microwaves. Bathing the universe that was emitted by the ancient cosmic matter.
[E] The principal NASA scientist for the New MAP spacecraft, Charles Bennett, says the heat patterns represent slight differences in the density of the young universe, where denser regions evolved into the present web of structures.
[F] NASA says the first results from the MAP mission will be ready in about 18 months after launch.
[G] The spacecraft will orbit the Earth seeking answers from an extremely faint glow of microwaves that have existed since the beginning of time.
【C5】
选项
答案
C
解析
该题的上一段最后一句是“极微小的光波样式,蕴含了解我们宇宙的历史、构成成分、形状以及最终命运的钥匙”。下一句的其中的一把钥匙就是…符合承上的作用,因此选C项“其中一把钥匙就是物质的数量和密度。较多的物质加上较高的密度,表明有较大的引力,从而减缓宇宙的扩散甚至最终的崩溃”。
转载请注明原文地址:https://kaotiyun.com/show/CgIZ777K
0
考研英语一
相关试题推荐
Scientistshavelongarguedovertherelativecontributionsofpracticeandnativetalenttothedevelopmentofeliteperformanc
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions1-5,choosethemostsuitableonefromthelistA-Gtofi
Intheearly20thcentury,ahorsenamedCleverHanswasbelievedcapableofcountingandotherimpressivementaltasks.Aftery
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse:
Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn."Peopleareinvite
Ofallthecomponentsofagoodnight’ssleep,dreamsseemtobeleastwithinourcontrol.Indreams,awindowopensintoaworl
Manytheoriesconcerningthecausesofjuveniledelinquency(crimescommittedbyyoungpeople)focuseitherontheindividualor
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【C1】______thet
TheU.S.systemofhighereducationiswidelyconsideredtheworld’sbest.Acollegeeducation【C1】______substantialbenefits—abo
随机试题
有限合伙人无权参与合伙企业事务。()
A.甲状腺内由多级乳头构成的肿瘤,上皮呈柱状,核呈空泡状B.甲状腺内滤泡构成的肿瘤,肿瘤组织浸润血管C.甲状腺内由异型性明显的巨细胞构成的肿瘤D.甲状腺内由异型性明显的梭形细胞构成的肿瘤E.甲状腺内由C细胞发生的癌乳头状癌
不开口于中鼻道的是
显微组织检验是用高倍显微镜来观察分析微观组织状态的( )。
国家逐步完善农村社会救济制度,保障()的基本生活。
下列关于板块构造学说的叙述,错误的是()。
农历七月十五日举行的盂兰盆会是()节日。
某家饭店中,一桌人边用餐边谈生意。其中,一个人是哈尔滨人,两个人是北方人,一个人是广东人,两个人只做电脑生意,三个人只做服装生意。如果以上介绍涉及餐桌上所有的人,那么这一桌最少可能是几个人?最多可能是几个人?
结合材料回答问题材料1中国作家莫言获得2012年诺贝尔文学奖。瑞典文学院给莫言的评价:一个文风魔幻现实主义、满是乡土气息、融汇历史和现实的作家。莫言曾经发过一条简短的微博:我最喜欢吃土豆,我最喜欢的书《聊斋志异》。莫言坦言,他将《席方平》的故事克隆进了
Whatcanbeinferredfromthenews?
最新回复
(
0
)