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  3. Nature’s ways of maintaining the balance are simple and easily understood. According to the passage, the people’s living of man

Nature’s ways of maintaining the balance are simple and easily understood. According to the passage, the people’s living of man

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问题 Nature’s ways of maintaining the balance are simple and easily understood.
According to the passage, the people’s living of many countries could be seriously threatened by ______.
选项
答案the loss of soil fertility
解析 由第四段第五句“Soil erosion results in loss of soil fertility and maintaining soil fertility is considered the biggest problem facing mankind apart from the prevention of war．”可知肥沃的土壤是阻止战争的重大问题，如果土壤不再肥沃，战争就可能爆发，世界人民的生活就会受到严重威胁。
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大学英语四级

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