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
35
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
A
解析
本题的空白处位于文章的第五段,随后的句子中出现的“These patterns…”为我们提供了线索,与之对应的是A项中的“…the heat patterns represent slight differences in the density of the young universe…,”其中“the heat patterns”与前段末尾的“variations in temperature”相呼应。B项的内容虽然与“MAP”的任务有关,但与上下文的内容不符,因此排除。故本题的正确选项为A项。
转载请注明原文地址:https://jikaoti.com/ti/svq7FFFM
0
考研英语一
相关试题推荐
HenryKissingerpublishedanarticleintheJune2018AtlanticMonthlydetailinghisbeliefartificialintelligence(AI)threate
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
Employeesareoftensaidtobeacompany’sbiggestresource.Itisequallytruethattheyareitsbiggestliability.Scarcelya
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
Nowondertheyarecalled"patients".Whenpeopleenterthehealth-caresystemsofrichcountriestoday,theyknowwhattheywil
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
Americans’prideandfaithoftheireconomicsystem,【C1】______thatitprovidesopportunitiesforallcitizenstohavegoodliv
随机试题
重度医院获得性肺炎,首选抗菌药物为
患肢可抬离床面,但是不能对抗阻力,其肌力为
A.定时服B.睡前服C.饭前服D.饭后服E.空腹服
防止病人坠床,最佳措施是
丁公司是否有权收购本公司股份?为什么?本案例中丁公司收购本公司股份的行为有哪些不符合法律规定之处?法院是否应当支持杨某的主张?为什么?
根据设计要求和规范规定进行试验,记录原始数据和计算结果,并得出试验结论的资料统称为( )。
完善的核算软件能够实现()。
简述我国民法中合同终止的情形。
多媒体技术:指利用计算机将各种媒体(包括文本、图形、声音、动画和视频等)以数字化的方式集成在一起,从而使计算机具有表现、处理、存储多种媒体信息的综合能力。多媒体的特征即信息表现形式的多样化,常见的有文本、图形、图像、声音和视频等多种形式。根据定义,
Inthefirstparagraph,theauthortellsusthatAsiaticlions______Whatimpressedtheauthormostwhenhewenttowatchthe
最新回复
(
0
)