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    【题目】Many people have fully realized it's important to keep __________ balance of __________ nature. Otherwise, humans will be punished by it.

    A. a; the B. the; the

    C. the; / D. /; /

    【答案】C

    【解析】句意：许多人充分认识到保持自然平衡很重要。否则，人类将受到它的惩罚。keep the balance of 保持……的平衡;nature自然，前面不加冠词。

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