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名词解释题
暗反应(dark reactions)
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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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番茄幼苗在缺镁的培养液中培养一段时间后，与对照组相比，其叶片光合作用强度下降，原因是（）A、光反应强度升高，暗反应强度降低B、光反应强度降低，暗反应强度降低C、光反应强度不变，暗反应强度降低D、光反应强度降低，暗反应强度不变
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下列有关光合作用的叙述，正确的是（）A、光反应和暗反应的进行都需要光B、光反应和暗反应的进行都需要酶的参与C、光反应和暗反应的进行都生成ATPD、光反应和暗反应都是在叶绿体的片层结构薄膜上进行
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番茄幼苗在缺镁培养液中培养一段时间后，与对照组相比，其叶片光合作用强度下降，原因是（）A、光反应强度升高，暗反应强度降低B、光反应强度降低，暗反应强度降低C、光反应强度不变，暗反应强度降低D、光反应强度降低，暗反应强度不变
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光合作用可分为光反应和暗反应两个阶段，下列叙述中正确的是（）A、光反应不需要酶，暗反应需要多种酶B、光反应消耗水，暗反应消耗ATPC、光反应固定CO2，暗反应还原CO2D、光反应储存能量，暗反应消耗能量
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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
callingC
whenD
it was already dark
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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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单选题Every field of chemistry _____ different chemical reactions.A
holdsB
consistsC
composesD
involves
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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
althoughC
whileD
nevertheless
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