四六级

　　英语六级听力是考生们的复习重点，分值比重高，复习难度大，所以我们更要在平时多加练习，下面小编给大家整理一篇英语六级听力常考的文章，考生们可以用作练习，希望对各位考生有所帮助。

　　Population Growth

　　1.What contributed to the first rapid increase in population? The

　　innovation of ...

　　2.When did the second jump in population begin from? Perhaps ...

　　3.What may happen to the present rapid population gronwth if technology begins to yield fewer innovations? It may ...

　　The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the contrary, demographic history offers evidence that population growth has not been at all constant. According to paleoecologist Edward Deevey, the past million years show three momentous changes. The first, a rapid increase in population around one million B. C., followed the innovations of tool-making and tool-using. But when the new power from the use of tools has been exploited, the rate of world population growth fell and became almost stable. The next rapid jump in population started perhaps 10,000 years ago, when mankind began to keep herds, plow and plant the earth. Once again when initial productivity gains had been absorbed, the rate of population growth abated. These two episodes suggest that the third great change, the present rapid growth, which began in the West between 250 and 350 years ago, may also slow down when, or if , technology begins to yield fewer innovations. Of course, the current knowledge revolution may continue without foreseeable end. Either way — contrary to popular belief in constant geometric growth — population can be expected in the long run to adjust to productivity. And when one takes this view, population growth is seen to represent economic progress and human triumph rather than social failure.

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