2. 外语
  3. Nature’s ways of maintaining the balance are simple and easily understood. The balance of nature is to be maintained so as to p

Nature’s ways of maintaining the balance are simple and easily understood. The balance of nature is to be maintained so as to p

admin2013-06-17  58
问题 Nature’s ways of maintaining the balance are simple and easily understood.
The balance of nature is to be maintained so as to prevent ______.
选项
答案soil deterioration
解析 由第四段第一句可知答案。
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大学英语四级

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