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Experts have differed about where the genus Varanus (monitor lizards) originated. Because most existing species live in Australia, early researchers concluded that Varanus originated in Australia and subsequently island hopped westward along the Indo-Australian archipelago. Herpetologist Robert Mertens later argued that Varanus probably originated in the archipelago. Chromosomal analysis has since supported Mertens` contention, and in addition, geologic evidence points to a collision between the archipelago and the Australian landmass after Varanus evolved-a fact that could account for the genus` present distribution. A related puzzle for scientists is the present distribution of Varanus` largest surviv-ing species, the Komodo dragon. These carnivores live only on four small islands in the archipelago where, scientists note, the prey base is too small to support mammalian carnivores. But the Komodo dragon has recently been shown to manage body tem-perature much more efficiently than do mammalian carnivores, enabling it to survive on about a tenth of the food energy required by a mammalian carnivore of comparable size.
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当前版本由 气到卸载 更新于2022-08-12 10:30:17 感谢由 气到卸载 对此题目的解答所做出的贡献。
A. 文中只提了支持Mertens的证据，但没有讲Mertens提出这个观点时用了什么证据（即，导致Mertens提出观点的证据）。因此选A
B. 证据第二句话：Because most existing species live in Australia，这是早期研究者提出蜥蜴起源于澳大利亚的原因
C. 证据是：geologic evidence points to a collision between the archipelago and the Australian landmass after Varanus evolved。 请注意，因为是澳大利亚和群岛碰撞，所以蜥蜴既可以起源于群岛后传播到澳大利亚，也可以起源于澳大利亚后传播到群岛。因此这个证据既能支持C，也能支持D
D. 如上
E. 证据同B。most existing species live in Australia，说明大部分现存蜥蜴物种生活在澳大利亚，而不是群岛。由此可回答现代蜥蜴物种在澳大利亚和群岛间的种群分布
当前版本由 气到卸载 更新于2022-08-12 10:29:42 感谢由 气到卸载 对此题目的解答所做出的贡献。
A. 文中只提了支持Mertens的证据，但没有讲Mertens提出这个观点时用了什么证据（即，导致Mertens提出观点的证据）
B. 证据第二句话：Because most existing species live in Australia，这是早期研究者提出蜥蜴起源于澳大利亚的原因
C. 证据是：geologic evidence points to a collision between the archipelago and the Australian landmass after Varanus evolved。 请注意，因为是澳大利亚和群岛碰撞，所以蜥蜴既可以起源于群岛后传播到澳大利亚，也可以起源于澳大利亚后传播到群岛。因此这个证据既能支持C，也能支持D
D. 如上
E. 证据同B。most existing species live in Australia，说明大部分现存蜥蜴物种生活在澳大利亚，而不是群岛。由此可回答现代蜥蜴物种在澳大利亚和群岛间的种群分布
当前版本由 长颈鹿在哪里呀 更新于2019-04-07 16:46:41 感谢由 长颈鹿在哪里呀 对此题目的解答所做出的贡献。
B选项的原因在文中可以找到Because most existing species live in Australia, C选项的方式在文中也有描述and subsequently island hopped westward along the Indo-Australian archipelago；A选项在文中没有指出，所以选A。
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(如果对题目有任何的疑惑，欢迎在这里提出来，大家会帮你解答的哦~)
气到卸载
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c應該是Varanus originated in Australia and subsequently “island hopped” 不是群島碰撞
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309911iu
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胡天翼
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胡天翼
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胡天翼
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因为染色体的证据是在Mertens提出假设之后的，所以并没有led他得出自己的结论。
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谢谢
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太牛了！！！！ 读文章要读到这么细致 ~~~
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