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名词解释题
暗视野显微镜（dark—field microscope）
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My little brother used to be afraid of the dark．（改为反意疑问句）My little brother used to be afraid of the dark，_____ _____?
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Dark Forces Dominate UniverseThe earth,moon,sun and all visible stars in the sky make up less than one percent of the universe.Almost all the rest is dark matter and dark energy,unknown forces that _______(1)astronomers.Observations in recent years have changed the basic_______(2)of how the universe evolved and have indicated how little is known about the major forces and substances that_______(3)our world.Astronomers now know that luminous（发光的）matter一stars , planets and hot gas一 accounts_______(4)only about 0.4 percent of the universe.Non-luminous components , such as black holes and intergalactic（星系间的）gas,_______(5) up 3.6 percent.The rest is either dark matter,about 23 percent,or dark energy,about 73 percent.Dark matter,sometimes_______(6)"cold dark matter,"has been known for some time.Only recently have researchers come to understand the key role it_______ (7)in the formation of stars,planets and even people."We_______(8)our very existence to dark matter,"said physicist PaulSteinhardt and a co-author of a review on dark matter which_______(9)not long ago in the journal Science."Dark matter dominated the structure_______(10)in the early universe," Steinhardt said."For the first few billion years dark matter contained most of the mass of the universe. You can think of ordinary matter_______(11)a froth（泡沫）of an ocean of dark matter. The dark matter clumps（结成块）and the ordinary matter falls into it. That_______(12) to the formation of the stars and galaxies（星系）."Without dark matter,"there would be virtually no structures in the universe,"The nature of dark matter is_______(13).It cannot be seen or detected directly. Astronomers know it is there because of its_______(14) on celestial（天体的）objects that can be seen and measured.But the most dominating force of all in the universe is called dark energy,a recently ________(15)power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed._________(11) A:with B:as C:from D:beside
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Which of the following statements is NOT true?（）AThe open field system provided a good opportunity to experiment.BThe open field system wasted land.CThe open field system was wasteful of labor and time.DThe open field system made livestock farming difficult.
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Which of the following statements is NOT true?（）A、The open field system provided a good opportunity to experiment.B、The open field system wasted land.C、The open field system was wasteful of labor and time.D、The open field system made livestock farming difficult.
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单选题They had the appearance of dark-skinned and dark-haired humans, _______ of course they were much smaller than ordinary people.A
howeverB
although C
while D
nevertheless
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the address field is computed B
jim should have used a text popup C
jim stored the field hint in the database D
field hint only display when the user has not clicked in the field （field hint）
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a commissioner of customs, and founded the field of modem economicsB
worked as commissioner of customs, and founded the field of modern economicsC
a commissioner of customs, and the founder of the field of modern economicsD
commissioned customs, and was the founder of the field of modern economicsE
a commissioner of customs, and was the founder of the field of modem economics
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单选题Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）A
the value of one field cannot be set from the value in another field B
the text string in the formula is set to null. Thus notes cannot validate the formula C
when setting the value of a field , the formula must be in the field‟s input validation event D
the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
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单选题The combination of lenses in a compound microscope makes possible greater amplification than can be achieved with a single lens.A
managementB
magnificenceC
magnetismD
magnification
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单选题Hardly did he hear his mother's calling when he realized that it was already dark.A
did he hearB
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whenD
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单选题_____ he realized it was too late to return home.A
No sooner it grew dark whenB
It was not until dark thatC
Scarcely it grew dark thanD
While it grew dark that
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electromagnetic field, revolving armature typeB
electromagnetic field, oscillatory armature typeC
armature, oscillatory electromagnet field typeD
armature, rotating electromagnetic field type
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howeverB
althoughC
whileD
nevertheless
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