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06-14
2015年6月13日的英语四级考试已经落下帷幕，本次考试为多题多卷，整理了不同版本的真题及参考答案，供考生参考，下面是留学群整理的2015年6月英语四级仔细阅读真题及答案，欢迎查看。
点击进入：2015年6月英语四级考试真题及答案
Passage Two
Questions 61 to 65 are based on the following passage.
Some of the world’s most significant problems never hit headlines. One 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 crops. A 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 soyabeans(大豆). They find that on between 24% and 39% of all harvested areas, the improvement in yields that took 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...
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