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填空题
Rainforest trees tightly rely on microorganisms.____
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解析：
根据题干信息“rainforest trees”和“rely on”可以定位到C段“rainforest trees closely rely on their evolutionary playmates—the surrounding flora and fauna”，故匹配段落为C段。
根据题干信息“rainforest trees”和“rely on”可以定位到C段“rainforest trees closely rely on their evolutionary playmates—the surrounding flora and fauna”，故匹配段落为C段。
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Because nothing remains on land except floods.B
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单选题A
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