51happened;it?llcontinuetohappen,andisn?titgreatthatwe?resolinguisticallyflexibleandcreative?”( )5.WhydoesthetextbeginwithKatherine?sconflictwithherson?A.Toleadintheuseofperiodintexting.B.Toemphasizethegreatpowerofwords.C.Toshowyoungsters?attitudestowardstexting.D.Tosuggesttherightuseofpunctuationmarks.( ...
If a predatorHow does an ecosystem(生态系统) work? What makescan eat several species,it can survive the extinction(灭绝) ofthe populations of different species the way they are? Why areone of them. And if a predator can move on to another speciesthere so many flies and so few wolves?
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第四段的第一句 “And unplanned human activities have proved the idea of top-down control by top predators to be true.(未经计划的人类 活动证明了顶端掠食动物自上而下控制的观点是正确 的)”是这一段的主题句,下面的例子是为了证明这句 话,根据本段最后一句句意“这些行为已经大大影响了 生态平衡”...
48. What will happen if the populations of top predators in a food web greatly decline? AThe prey species they directly attack will die out., BThe species they indirectly attack will turn into top predators., CThe living environment of other species will remain unchanged., DThe populations ...
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Chapter 1. geography, people and language. Think and talk. Do you know the full name of Britain? Do you know the geographical features of this country? Do you know its major cities, London, Ed…
坍塌也分成房顶平塌、墙体外倒、墙体内倒和房顶M型向下弯折几种。所以，尽管观察地震造成的废墟，我们可以发现在一些位置上确实存在类似的“三角空间”，不过，在地震发生时，人们无法预先知道地震的方式、倒塌发生的方向，也就无法知道什么地方会有所谓的“三角求生空间”。这段文字意在说明：（）
Within this membrane, a cell's interior environment is water based. Called cytoplasm, this liquid environment is packed full of cellular machinery and structural elements. In fact, the concentrations of proteins inside a cell far outnumber those on the outside — whether the outside is ocean wa...
The prey species they directly attack will die outB. The species they indirectly attack willtum into top predators.C. The Iving environment of other species wil rem ain unchanged.D. The populations of other species will experience unexpected changes.49. What conclusion can be drawn from the ...