Nature’s ways of maintaining the balance are simple and easily understood. [br]

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问题 Nature’s ways of maintaining the balance are simple and easily understood. [br] The balance of nature can prevent soil deterioration.

选项 A、Y
B、N
C、NG

答案 A

解析第四段第一句“The balance of nature is...prevent soil deterioration”可知生态平衡可起到prevent soil deterioration的作用。

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