考前必看:2021年考研英语工学类阅读理解模拟题及答案(三十一)
发布时间:2020-10-12
最近,有小伙伴在询问最后阶段,考研英语该如何备考才最有效。最后阶段,我们应该将备考的重点放在复习和了解考试上,多去练习历年真题和模拟试题。下面,51题库考试学习网为大家带来考研初试的一些模拟试题,一起来看看吧。
Say this for the structure of the universe: it does tend to repeat itself. Stars
orbit the pivot point at the center of galaxies, planets in turn orbit stars, and moons in turn orbit planets. Last week astronomers writing in
the journal Nature announced that this cosmic reductionism goes even further.
For the first time, ground-based telescopes spotted a tiny moonlet orbiting a mere asteroid in
Earth\'s own solar system.
In most respects the asteroid that\'s
causing the celestial stir is nothing remarkable. Known to astronomers as
Eugenia, it measures about
133 miles across and is one of thousands of bits of cosmic flotsam in the great
rubble stream between Mars and Jupiter. When an international team of
astronomers working at the Canada-France-Hawaii Telescope (CFHT) on Mauna Kea
in Hawaii turned their attention toward Eugenia one evening last fall, however, they spotted something curious. Off on the upper-left corner of the
fuzzy-looking image was another smear of light they couldn\'t identify. “These blobs are often artifacts of the
optics,” says astronomer
William Merline, head of the team, “but this blob hung
around. Once we saw it was moving in a pattern consistent with an orbit, we knew it was a satellite.”
The Hawaii discovery did not mark the first
time a moonlet had been found around an asteroid. In 1993 the Galileo
spacecraft sped past the 20-mile-wide asteroid Ida and spotted a scrap of moon
just under a mile wide circling it. But the only way Galileo could detect the
tiny target was to fly there across many millions of miles of space and do its
exploring up close. Now, thanks
to new optics in the CFHT, it\'s
possible to search for moonlets from the comfortable perch of a faraway Earth.
Light streaming in from space tends to get
distorted by the planet\'s atmosphere, causing a star\'s familiar twinkle. The CFHT, however, is equipped with optical hardware that lets it calibrate itself on
the light from a known star——whose
degree of atmospheric distortion will generally be predictable——and then use that information to correct
the distortion of other, unknown bodies. A little fiddling with the incoming image and even the
blurriest picture snaps right into focus.
Already the discovery of the moonlet is
paying scientific dividends. By analyzing the orbit of the satellite, astronomers are drawing surprising
inferences about the composition of Eugenia itself. Most asteroids are thought
to be about three times as dense as water, but Eugenia is barely 20% denser, suggesting it either is made of loosely packed rubble or is rich in
ordinary ice. Further analysis could help settle the question, and more discoveries of more moonlets
could shed similar light on Eugenia\'s asteroid-belt sisters.
注(1):本文选自Time,10/18/99, p83;
注(2):本文习题命题模仿对象2004年真题text 3;
1. By saying “it does tend to repeat itself”, the author means ___________.
[A] the structure of the universe always
appears again and again
[B] the universe itself is liable to repeat
[C] the stars in the universe always orbit
the pivot point at the center of the galaxies
[D] the structure of celestial bodies in
the universe are really always similar
2. By “the fuzzy-looking image”,(Line 6,Paragraph
2)the author is actually referring
to______.
[A] Eugenia
[B] a artifact
[C] a satellite
[D] the orbit
3. How do people think of the new optics at
the GFHT?
[A] comfortable
[B] helpful
[C] thankful
[D] faraway
4. Why can little fiddling with the
incoming image and even the blurriest picture snap right
into focus?
[A] The optical hardware makes this
possible.
[B] The stars‘ twinkle helps a lot.
[C] The atmospheric distortion gives help.
[D] The information from unknown stars can
be used.
5. Which of the following is true according
to the passage?
[A] The discovery of moonlet is paying
money now.
[B] More discoveries of more moonlets could
give light to other similar asteroids.
[C] The Eugenia is not as dense as most
asteroids.
[D] Eugenia is certainly made of small
rubbles.
答案:D A B A C
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下面小编为大家准备了 研究生入学 的相关考题,供大家学习参考。
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