文档介绍：精选优质文档-----倾情为你奉上
精选优质文档-----倾情为你奉上
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精选优质文档-----倾情为你奉上
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2015年6月大学英语六级考试阅读的sec
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精选优质文档-----倾情为你奉上
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43. A benefits
44. E impact
45. D eventually
Passage Two
Questions 61-65 are based on the following passage.
Some of the world’s most significant problems never hit example comes from agriculture. Food riots and hunger make news. But the trend lying behind these matters is rarely talked about. This is the decline in the growth in yields of some of the world’s major new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.
The authors take a vast number of data points for the four most important crops: rice, wheat corn and soybeans(大豆). They find that on between 24% and 39% of all harvested areas, the improvement in yields that tood place before the 1980s slowed down in the 1990s and 2000s.
There are two worrying features of the slowdown. One is that it has been particularly sharp in the world’s most populous(人口多的) countries, India and China. Their ability to feed themselves has been an important source of relative stability both within the countries and on world food markets. That self-sufficiency cannot be taken for granted if yields continue to slow down or reverse.
Second, yie