Today there has been a change of attitude towards nature. This is shown in ______. What does the sentence "The air helps purify

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问题 Today there has been a change of attitude towards nature. This is shown in ______.
What does the sentence "The air helps purify the water" illustrate?

选项 A、The ecological balance.
B、The water cycle.
C、The earth’s limited resources.
D、The life cycle.

答案A

解析 本题考查利用文章内容进行推断的能力。"The air helps purify the water"这句话出现在文章第四段的最后一部分,根据该句前面一句的内容"These resources are tied together in a complex set of transactions".我们不难看出这里讲到是生态链及生态平衡的问题。
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