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
In the following text, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list (A、B、C、
In the following text, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list (A、B、C、
admin
2010-09-06
44
问题
In the following text, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list (A、B、C、D、E、F、G……) to fit into each of the numbered blank. There are several extra choices, which do not fit in any of the gaps. (10 points)
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. (41)______.
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. (42)______. 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. (43)______. "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.
(44)______. "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".
(45)______. 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. 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 me, fins mole 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 h 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
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。
转载请注明原文地址:https://kaotiyun.com/show/VsZ4777K
0
考研英语一
相关试题推荐
Ahistoryoflongandeffortlesssuccesscanbeadreadfulhandicap,but,ifproperlyhandled,itmaybecomeadrivingforce.Wh
Innovationiskeytobusinesssurvival,andcompaniesputsubstantialresourcesintoinspiringemployeestodevelopnewideas.T
Nottoomanydecadesago,itseemed"obvious"bothtothegeneralpublicandtosociologiststhatmodernsocietyhaschangedpeo
Writeanessaybasedonthefollowingchart.Inyourwriting,youshould1)interpretthechart,and2)giveyourcomments.You
Writeanessaybasedonthefollowingchart.Inyourwriting,youshould1)interpretthechart,and2)giveyourcomments.You
Writeanessaybycommentingonthefollowingsaying.Youcangiveexamplestoillustrateyourpoint.Youshouldwriteabout150
ItcanbelearntfromthetextthattherulingpartyinIndiaWhichofthefollowingstatementsisTRUEaccordingtothetext?
AccordingtothosewhosupporttheliberalizationofEurope’senergymarkets,energysupplymonopolyisunlikelyonthegrounds
随机试题
文学家、艺术家等属于()
对于新从事的工作或统计资料缺乏的工作,可以根据管理人员的()来为之建立标准。
阳虚发热证的临床特征是
女,35岁。尿频、尿痛伴肉眼血尿1天。既往体健。查体无异常。尿亚硝酸盐阳性,尿沉渣镜检红、白细胞满视野。抗生素疗程一般为
A.芒硝B.雄黄C.自然铜D.炉甘石E.赭石
某企业购买面值为200万元,到期时—次还本付息的公司债券作为长期投资,共支付价款225万元,其中含手续费2万元(金额较大)和应计利息23万元。该项债券投资应记入“长期债权投资”科目的金额为()万元。
教育上“准受益,谁出钱”这一提法如果是正确的话,只能理解为国家是教育的最大受益者。这是因为,一方面,教育的经济效益,虽然不能直接、立即体现在市场经济交换过程中,却存在于社会之中;另一方面教育不仅有经济效益,而且是国家综合国力的重要组成部分。因此( )。
TheclashatConcordandLexingtonwas______.
Afireisalwaysexcitinganddangerous.Peoplecrowdaroundtowatchthesmoke,theflames,andthefirefighters,whoriskthe
A、ExcitedB、Embarrassed.C、Worried.D、Relieved.D理解该问的关键在于女士的第一句话Thankgoodness!,结合语境理解,知道男士较为及时的到来缓解了她的恐慌(panic),她应该是放松的。故选D)项。
最新回复
(
0
)