单选题A large group of stars revolving around a center is known as a（）.AclusterBshowerCconstellationDgalaxy
单选题
A large group of stars revolving around a center is known as a（）.
A
cluster
B
shower
C
constellation
D
galaxy
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Text 2 To understand how astrology works, we should first take a quick look at the sky. Although the stars are at enormous distances, they do indeed give the impression of being affixed to the inner surface of a great hollow sphere surrounding the earth. Ancient people, in fact, literally believed in the existence of such a celestial sphere. As the earth spins on its axis, the celestial sphere appears to turn about us each day, pivoting at points on a line with the earth's axis of rotation. This daily turning of the sphere carries the stars around the sky, causing most of them to rise and set, but they, and constellations they define, maintains fixed patterns on the sphere, just as the continent of Australian maintains its shape on a spinning globe of the earth. Thus the stars were called fixed stars.The motion of the sun along the ecliptic is, of course, merely a reflection of the revolution of the earth around the sun, but the ancients believed the earth was fixed and the sun had an independent motion of its own, eastward among the stars. The glare of sunlight hides the stars in daytime, but the ancients were aware that the stars were up there even at night, and the slow eastward motion of the sun around the sky, at the rate of about thirty degrees each month, caused different stars to be visible at night at different times of the year.The moon, revolving around the earth each month, also has an independent motion in the sky. The moon, however, changes its position relatively rapidly. Although it appears to rise and set each day, as does nearly everything else in the sky, we can see the moon changing position during as short an interval as an hour or so. The moon's path around the earth lies nearly in the same plane as the earth's path around the sun, so the moon is never seen very far from the ecliptic in the sky. There are five other objects visible to the naked eye that also appear to move in respect to the fixed background of stars on the celestial sphere. These are the planets Mercury, Venus, Mars, Jupiter, and the Saturn. All of them revolve around the sun in nearly the same plane as the earth does, so they, like the moon, always appear near the ecliptic. Because we see the planets from the moving earth, however, they behave in a complicated way, with their apparent motions on the celestial sphere reflection both their own independent motions around the sun and our motion as well.第26题：The ancient people believed that ________.[A] the earth was spinning on the axis of the sky[B] the sky was a hollow sphere spinning around the earth[C] the patterns of stars on the sky would never change[D] the stars around the sky were not stationary
According to the passage which of the following is true?[A] A fixed star refers a star that is always stationary on the sky.[B] Scientists can tell the motion of the earth from the motions of other five planets.[C] Ancient people had scanty knowledge about the movement of the stars.[D] All the stars on the sky can be seen all the year around.
There might be a massive black hole at the center of our galaxy______(swallow)up stars at a very rapid rate.
The circulation around a low pressure center in the Northern Hemisphere is ______.A.counterclockwiseB.variableC.clockwiseD.Anticyclonic
I’m glad ____________ to look around your research center.A、to allowB、having allowedC、to be allowedD、being allowed
When hosts place dishes on the table, they will arrange the main course at the center with the other dishes______ placed around them.A、evenlyB、evenC、oddD、oddly
When the________is large, the ship is stiff;and when it is small,she is tender.A.GMB.Free surfaceC.Longitudinal center of gravityD.transverse center of gravity
A slow and easy motion of a vessel in a seaway is an indication of a ______．A.Small GMB.Low center of gravityC.Stiff vesselD.Large GZ
Laying out a line in successive circles flat on deck with the bitter end in the center is known as ______.A.coilingB.fakingC.flemishingD.Lining
共用题干Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the stars as you do.He observed carefully,and learned many things about the sun,the moon,and the stars.2 Suppose you were asked to collect evidence about the sun as early man did.You might go out morning after morning and see it come up in the east.Even on cloudy mornings,youwould observe that the darkness goes away and the world becomes light.You might not see the sun but would be sure it is there,because you notice that the earth warms up.As you continued,the sun climbs higher in the sky each day during part of the year. It stays in the sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell exactly why it happens.But you realize that the sun seems to make the difference. Primitive（原始的）man felt that since the sun was so powerful it must be a god. It may seem silly to us now to worship（崇拜）a sun-god, but primitive man was right about the importance of the sun to life on earth.4 You have been told that the world is round.But suppose no one had ever taught you that the world was like a huge ball.Would you have ever thought of it yourself?You cannot see the curve（曲线）of the earth at once. You would have no idea of how big it was. That's why early man believed that the earth was small and flat.Such ideas appeared from the evidence they had.5 If you watch the stars night after night,you will see them rise and set.As you look at the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling（闪烁）lights. Some early astronomers（天文学家）believed the sky was a crystal shell or series of crystal shells,one inside the other. They believed this because that is what the night sky looked like.For many centuries,men believed that the earth was the center of the universe and that the sun,the moon,and the stars circled around it.Early man thought the earth was the center of the universe because_________.A:he did not observe the sun carefully enoughB:he could not see its curveC:the sun,the moon and the stars seemed to move around itD:the earth circles around the sunE:it looked like that at nightF:it has power over life on earth
Today,the City of London is the business center of London where（）are located.A、big supermarketsB、theatres and cinemasC、large financial organizationsD、restaurants and cafes
单选题A large basin cut into the shore，closed off by a caisson，and used for dry docking of ships is known as a（）.AslipwayBgraving dockCground warpDcaisson dock
单选题The difference between the height of the metacenter and the height of the center of gravity is known as the（）.Ametacentric heightBheight of the righting armCfore and aft perpendicularDheight of the center of buoyancy
单选题Because the actual center of some planets may differ from the observed center，the navigator applies a correction known as the（）.Aphase correctionBrefraction correctionCsemidiameter correctionDaugmentation correction
单选题These stars form a group, the shape of _____ is rather like the shape of a watch.AthatBwhichCwhomDwhose
单选题Which statement is TRUE of a stiff vessel? （）AShe will have a large metacentric heightBHer period of roll will be large due to her large metacentric heightCShe will have an unusually high center of gravityDShe will pitch heavily
单选题That center around which a vessel trims is called the（）.Atipping centerBcenter of buoyancyCcenter of gravityDturning center
单选题Running Man, is a popular show these days. Some well-known stars challenge themselves to finish all kinds of tasks ______ in it.AluckilyBbravelyCeasilyDdifferently
单选题A large basin cut into the shore，closed off by a caisson，and used for drydocking of ships is known as a（）.AslipwayBgraving dockCground warpDcaisson dock
单选题When the（）is large, the ship is stiff; and when it is small, she is tender.AGMBfree surfaceClongitudinal center of gravityDtransverse center of gravity
单选题Laying out a line in successive circles flat on deck with the bitter end in the center is known as（）.AcoilingBfakingCflemishingDlining
单选题A System z customer is planning to deploy the IBM System Storage DS6800 in each of threesmall data centers located around a large city. A backup data center with an IBM System StorageDS8100 will serve as the disaster recovery facility. Which advanced function can the customerimplement to meet disaster recovery requirements?（）AGlobal Mirror for zSeriesBMetro MirrorCGlobal CopyDMetro/Global Mirror
单选题The universe has more than 100 billion separate systems of stars and gas known as _____.AgalleriesBgangstersCgalaxiesDgarments
单选题A group of stars which appear close together and form a striking configuration such as a person or animal is a（）.AclusterBshowerCconstellationDgalaxy
单选题A disease known as chestnut blight wiped out large numbers of American chestnut trees.AalteredBpenetratedCdevaluedDdestroyed
单选题The circulation around a low pressure center in the Northern Hemisphere is（）.AcounterclockwiseBvariableCclockwiseDanticyclonic