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1、公共英语四级考试阅读备考练习题公共英语四级考试阅读备考练习题我喜爱动身，只为到达的.地方都属于昨天，哪怕那山再清，那 水再秀，那风再温顺，太深的留恋便成了一种羁绊，绊住的不仅有双 脚，还有将来。以下是我为大家搜寻整理的公共英语四级考试阅读备 考练习题，期望能给大家带来帮忙!更多精彩内容请准时关注我们应 届毕业生考试网！Sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become di
2、fficult 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, i
3、t 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 effec
4、t on biodiversity, 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 specialize and incr
5、ease yields. Throughout this period food became cheaper, safe and more reliable. However, these changes have also led to habitat （栖息地）loss and to diminishing biodiversity.Whats more, demand for animal products in developing countries is growing so fast that meeting it will require an extra 300 milli
6、on tons of grain a year by 2050. yet the growth of cities and industry is reducing the amount of water available for agriculture in many regions.All this means that agriculture in the 21stcentury will have to be very different from how it was in the 20th. thiswill require radical thinking. For examp
7、le, we need to move away from the idea that traditional practices are inevitably more sustainable than new ones. We also need to abandon the notion that agriculture can be zero impact. The key will be to abandon the rather simple and static measures of sustainability, which centre on the need to mai
8、ntain production without increasing damage.Instead we need a more dynamic interpretation, one that looks at the pros and cons （正反两方面）of all the various way land is used. There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purit
9、y, carbon footprint and biodiversity. It is clear, for example, that the carbon of transporting tomatoes from Spain to the UK is less than that of producing them in the UK with additional heating and lighting. But we do not know whether lower carbon footprints will always be better for biodiversity.
10、What is crucial is recognizing that sustainable agriculture is not just about sustainable food production.1. How do people often measure progress in agriculture?A) By its productivity C) By its impact on the environmentB) By its sustainability D) By its contribution to economic growth2. Specialisati
11、on and the effort to increase yields have resulted in.A) Localised pollution C) competition from overseasB) the shrinking of farmland D) the decrease of biodiversity3. What does the author think of traditional farming practices?A) They have remained the same over the centuries B) They have not kept
12、pace with population growthC) They are not necessarily sustainable D) They are environmentally friendly4. What will agriculture be like in the 21st centuryA) It will go through radical changes B) It will supply more animal productsC) It will abandon traditional farming practices D) It will cause zer
13、o damage to the environment5 What is the authors purpose in writing this passage?A) To remind people of the need of sustainable developmentB) To suggest ways of ensuring sustainable food productionC) To advance new criteria for measuring farming progressD) To urge people to rethink what sustainable agriculture is参考答案：BDCAD文档内容到此结束，欢迎大家下载、修改、丰富并分享给更多有 需要的人。