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Tropical forests typically have many more species of plants and animals than do temperate forests of comparable size. During the Ice Age, forests in temperate regions were destroyed, while those in the tropics were not. Accordingly, one proposed explanation of this difference in the number of species is that tropical forests typically had a much longer period than temperate forests in which different species could take hold.
当前版本由371524c更新于2020-04-22 15:53:47 感谢由371524c对此题目的解答所做出的贡献。
答案：D。逻辑单题。
原文的逻辑链条是：热带森林的period 更长，因此有利于different species。支持这一推理可以通过“去他因”。D选项“自冰河时代以来出现的热带森林的动植物物种数量并不比同等规模的温带森林多。”可以起到这个作用。
ABCE均为无关选项。
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