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
2020-03-31
40
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. (1)______
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. (2) ______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. (3)______
"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.
(4)______"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."
(5)______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, Charles 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] 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.
[B] NASA says the first results from the MAP mission will be ready in about 18 months after launch.
[C] The spacecraft will orbit the Earth seeking answers from an extremely faint glow of microwaves that have existed since the beginning of time.
[D] Scientists are trying to learn how it clumped together to produce stars, clusters of stars called galaxies, and clusters of galaxies.
[E] Astronomers are reporting evidence that points to a massive star-eating black hole at the center of our Milky Way galaxy.
[F] One of those keys is the amount of matter and its density. More matter with a higher density means more gravitational pull, suggesting a slowing of the universe’s expansion, and perhaps even its collapse.
[G] 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.
选项
答案
D
解析
本题的空白处位于文章的第二段,这一段讲述了有关宇宙起源的“大爆炸”理论,即在宇宙之始,所有的物质和能量都聚合在一起,在130~150亿年前,逐渐增加的密度和温度导致了一场大爆炸,使得所有的物质朝着不同的方向飞散而去。空白处之后的一句:“They also ask…”中的“also”暗示前句提到的应该也是一个疑问。D项“Scientists are trying to learn how it…”正是科学家的疑问。另外“scientists”也正与“They”相呼应,由此可以推断D项“科学家们试图了解这些物质是如何聚集在一起形成星辰、星系和星河的”正确。
转载请注明原文地址:https://kaotiyun.com/show/KE1Z777K
0
考研英语一
相关试题推荐
Employeesareoftensaidtobeacompany’sbiggestresource.Itisequallytruethattheyareitsbiggestliability.Scarcelya
Employeesareoftensaidtobeacompany’sbiggestresource.Itisequallytruethattheyareitsbiggestliability.Scarcelya
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
Healthimpliesmorethanphysicalfitness.Italsoimpliesmentalandemotionalwell-being.Anangry,frustrated,emotionally【C1
Healthimpliesmorethanphysicalfitness.Italsoimpliesmentalandemotionalwell-being.Anangry,frustrated,emotionally【C1
Childrenmodelthemselveslargelyontheirparents.Theydosomainlythroughidentification.Childrenidentify【C1】______aparen
Childrenmodelthemselveslargelyontheirparents.Theydosomainlythroughidentification.Childrenidentify【C1】______aparen
Childrenmodelthemselveslargelyontheirparents.Theydosomainlythroughidentification.Childrenidentify【C1】______aparen
Americans’prideandfaithoftheireconomicsystem,【C1】______thatitprovidesopportunitiesforallcitizenstohavegoodliv
随机试题
关于嗜碱粒细胞,哪项错误()
孔子要求人们:“非礼勿视,非礼勿听,非礼勿言,非礼勿动。”记载这句话的是()
某乡5000户人口,欲抽取其1/10进行某病调查,随机抽取1户开始后,每隔10户抽取1户,抽到的户作为样本,这种抽样方法为_______。
缩窄性心包炎可能的主要病因是
医疗机构发现传染病时应当及时采取的措施不包括的是
2005年全国人大通过的《反分裂国家法》是一部促进祖国统一的法律。以和平方式实现祖国统一,最符合台湾海峡两岸同胞的根本利益,但是在特殊情况下并不排除以非和平方式及其他必要措施捍卫国家主权和领土完整。根据《反分裂国家法》的规定,下列关于国家采取非和平方式及其
下列对中国经济新常态的理解,不正确的是:
李白诗云:“吴宫花草埋幽径,晋代衣冠成古丘。”这里李白咏叹的古都是()。
Fordecades,postersdepictingrabbitswithinflamed,reddenedeyessymbolizedcampaignsagainstthetestingofcosmeticsonani
A、Becauseheisinterestedinthesubject.B、Becausehehasalreadywrittenapaperonit.C、Becausehedoesn’tknowanythingab
最新回复
(
0
)