四级阅读强化训练600题pdf 四级阅读专项训练汇总
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sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become difficult to question either the basic assumptions behind it or the way the concept is put to use. this is especially true in agriculture, where sustainable development is often taken as the sole measure of progress without a proper appreciation of historical and cultural perspectives.
to start with, it is important to remember that the nature of agriculture has changed markedly throughout history, and will continue to do so .medieval agriculture in northern europe fed, clothed and sheltered a predominantly rural society with a much lower population density than it is today. it had minimal effect on biospanersity, and any pollution it caused was typically localized. in terms of energy use and the nutrients captured in the product it was relatively inefficient.
contrast this with farming since the start of the industrial revolution. competition from overseas led farmers to s
四级阅读强化训练600题pdf 四级阅读专项训练汇总
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