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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 08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]Genetically Modified Foods?Feed the
World?
[00:
  03.67]If you want to spark a heated debate at a dinner party,
[00:
  08.68]bring up the topic of genetically modified foods.
[00:
  11.75]For many people, the concept of genetically altered,
[00:
  15.46]high-tech crop production raises all kinds of environmental,
[00:
  19.73]health, safety and ethical questions.
[00:
  22.70]Particularly in countries with long agrarian traditions?
[00:
  26.62]and vocal green lobbies?
[00:
  28.71]the idea seems against nature.
[00:
  30.77]In fact, genetically modified foods are already very much a part of
our lives.
[00:
  36.46]A third of the corn and more than half the soybeans
[00:
  40.18]and cotton grown in the US last year were the product of
biotechnology,
[00:
  44.99]according to the Department of Agriculture.
[00:
  47.63]More than 65 million acres of genetically modified crops
[00:
  52.32]will be planted in the US this year.
[00:
  54.53]The genetic is out of the bottle.
[00:
  57.03]The issue is simple and urgent:
[00:
  59.54]Do the benefits of biotech outweigh the risks?
[01:
  02.72]The statistics on population growth and hunger are disturbing.
[01:
  07.09]Last year the world’s population reached 6 billion.
[01:
  10.58]And by 2050, the UN estimates,
[01:
  13.77]it will probably near 9 billion.
[01:
  16.30]almost all that growth occer in developing countries.
[01:
  20.00]At the same time,
[01:
  20.82]the world’s available cultivable land per person is declining.
[01:
  25.40]The UN estimates that nearly 800 million people
[01:
  29.45]around the world are undernourished.
[01:
  31.53]The effects are devastating.
[01:
  33.40]How can biotech help?
[01:
  35.57]Biotechnologists have developed genetically modified rice
[01:
  39.73]that is fortified with beta-carotene --
[01:
  42.04]which the body converts into vitamin A?
[01:
  44.54]and additional iron,
[01:
  46.30]and they are working on other kinds of nutritionally improved crops.
[01:
  50.78]Biotech can also improve farming productivity in places
[01:
  54.71]where food shortages are caused by crop damage attribution to pests,
[01:
  59.65]drought, poor soil and crop viruses, bacteria or fungi.
[02:
  04.47]Damage caused by pests is incredible.
[02:
  07.19]The European corn borer, for example,
[02:
  09.71]destroys 40 million tons of the world’s corn crop annually,
[02:
  14.20]about 7% of the total.
[02:
  16.37]Incorporating pest-resistant genes into seeds can help restore the
balance.
[02:
  21.51]In trials of pest-resistant cotton in Africa,
[02:
  24.59]yields have increased significantly.
[02:
  27.20]So far, fears that genetically modified,
[02:
  30.50]pest-resistant crops might kill good insects as well as bad appear
unfounded.
[02:
  36.50]Viruses often cause massive failure in staple crops in developing
countries.
[02:
  41.97]Two years ago, Africa lost more than half its cassava crop?
[02:
  46.01]a key source of calories?
[02:
  47.88]to the mosaic virus.
[02:
  49.52]Genetically modified,
[02:
  51.06]virus-resistant crops can reduce that damage,
[02:
  53.78]as can drought-tolerant seeds in regions
[02:
  57.17]where water shortages limit the amount of land under cultivation.
[03:
  00.69]Biotech can also help solve the problem of soil that contains excess
aluminum,
[03:
  06.24]which can damage roots and cause many staple-crop failures.
[03:
  10.09]A gene that helps neutralize aluminum toxicity in rice has been
identified.
[03:
  16.00]Many scientists believe biotech could raise overall crop productivity
in developing countries
[03:
  22.10]as much as 25% and help prevent the loss of those crops after they are
harvested.
(责编:CSCSCS)
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