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晨读六级英语美文60篇MP3(含lrc字幕)文章搜索:晨读六级英语美文60篇MP3(含lrc字幕)科技-度海量天2 09作者:CSCSCS
来源:人人听力网 时间:09-05-24 阅读:纠错 [划词翻译已开启]
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  00.00]Man Is Altering the Balance of Nature
[00:
  05.68]The balance of nature is a very elaborate
[00:
  09.66]and very delicate system of checks and counterchecks.
[00:
  13.60]It is continually being altered as climates change,
[00:
  16.66]as new organisms evolve,
[00:
  18.74]as animals or plants permeate to new area.
[00:
  22.68]But the alternations have in the past,
[00:
  25.95]for the most part,
[00:
  27.49]been slow, whereas with the arrival of civilized man,
[00:
  31.09]their speed has been multiplied many fold:
[00:
  33.83]From the evolutionary time scale where change
[00:
  37.66]is measured by periods of ten or a hundred thousand years,
[00:
  41.58]they have been transferred to the human time scale
[00:
  44.67]in which centuries and even decades count.
[00:
  47.38]Everywhere man is altering the balance of nature.
[00:
  51.65]He is facilitating the spread of plants and animals into new regions,
[00:
  56.79]sometimes deliberately,
[00:
  58.44]sometimes unconsciously.
[01:
  00.31]He is covering huge areas with new kinds of plants,
[01:
  04.24]or with houses, factories,
[01:
  06.75]slagheaps and other products of the civilization.
[01:
  10.26]He exterminates some species on a large scale,
[01:
  13.97]but favours the multiplication of others.
[01:
  16.91]In brief, he has done more in five thousand years
[01:
  20.65]to alter the biological aspect of the planet
[01:
  23.38]than has nature in five million.
[01:
  25.79]Many of these changes
[01:
  27.64]which he has brought about have had unforeseen consequences.
[01:
  31.79]Who would have thought that
[01:
  34.09]the throwing away of a piece of Canadian waterweed
[01:
  36.81]would have caused half the waterways of Britain to be blocked for a
decade?
[01:
  40.88]Or that the provision of pot cacti for lonely settlers’ wives
[01:
  45.36]would have led to Eastern Australia
[01:
  47.53]being overrun with forest of Prickly Pear?
[01:
  50.29]Who would have prophesied that the cutting down of forests
[01:
  54.11]on the Adriatic coasts,
[01:
  55.98]or in the parts of Central Africa,
[01:
  58.04]could have reached the land to semi desert,
[02:
  01.11]with the very soil washed away from the bare rock?
[02:
  04.50]Who would have thought that improved communications
[02:
  08.10]would have changed history
[02:
  09.86]by the spreading of disease?
[02:
  11.62]sleeping sickness into East Africa,
[02:
  14.01]measles into Oceania,
[02:
  16.13]very possibly malaria into ancient Greece?
[02:
  19.73]These are spectacular examples;
[02:
  22.34]but examples on a smaller scale are everywhere to be found.
[02:
  26.30]We make a nature sanctuary for rare birds,
[02:
  29.68]prescribing absolute security for all species;
[02:
  33.18]and we may find that some common
[02:
  35.48]and hardy kind of bird multiplies beyond measure
[02:
  39.31]and ousts the rare kinds in which we are particularly interested.
[02:
  43.13]We see, owing to some little change brought about by civilization,
[02:
  47.72]the startling spread over the English countryside in hordes.
[02:
  52.22]We improve the yielding capacities of our cattle;
[02:
  55.50]and find that now they exhaust the pastures
[02:
  58.88]which sufficed for less exigent stock.
[03:
  01.63]We gaily set about killing the carnivores that molest our domestic
animals,
[03:
  06.44]the hawks that eat our fowls and game-birds;
[03:
  09.49]and find that in so doing we are also removing the brake
[03:
  13.75]that restrains the multiplication of mice
[03:
  16.28]and other little rodents that gnaw away the farmer’s profits.
(责编:CSCSCS)
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