TTGWD11-Q24 to Q27讨论答案

gracezz

我决定33题我还选E。。。。

像风一样离去

DBAD

冰雪蜂鸟

终于研究明白36题了，选D！

题目问的是：The passage suggests that if a grass-dwelling anole lizard species evolved on one island and then traveled over water to colonize a second island, the grass-dwelling anoles on the two islands would eventually
也就是说这个“如果是通过这个现象进化的”，那么grass-dwelling anoles在两个岛上的情况是什么样。
定位应该在文章的第一段，而非讲DNA的第二段！

原文：...An ancestral species might have adapted to exploit a particular ecological niche on one island and then traveled over water to colonize other islands....  After the islands separated, the isolated lizard populations would have become distinct species while also retaining their ancestors’ niche adaptations. Both of these scenarios imply that specialization to each niche occurred only once. Alternatively, ....(相反的independent的情况)
再往下看第二段第一句：If each type of specialist evolved just once, then similar specialists on different islands would be closely related. （相反的independent的情况）

这个现象在第一段给出是distinct specis 以及 occurred only once,第二段第一句明确写出了 would be closely related.

A.    develop very different DNA sequences （定位错）
B.    develop into different species that are more distantly related to each other than to tree- and twig-dwelling anoles on their own islands （这个观点在第二段描述很混乱，而且我感觉第二句和最后一句说的是相反的，但是无论如何这句话都说的是如果是independent进化的结果，并非just once, 排除！）
C.    come to differ significantly from one another in habitat use （无关）
D.    develop into different, but closely related, species （原文有明确提示）
E.    evolve significant morphological differences （无关）

wendygoon

靠。。明白了，，

caoqin1981

36题的答案比较散，问 古巴 和 牙买加 树 蜥蜴 的 对的
原文Moreover, the Puerto Rican twig species closely resembles the twig species of Cuba, Hispaniola, and Jamaica in morphology, habitat use, and behavior.和These species also differ morphologically: grass dwellers are slender with long tails, tree dwellers are stocky with long legs, twig dwellers are slender but stubby-legged.

caoqin1981

26可从  twig dwellers are slender but stubby-legged，和
same three types of habitat specialists occur on each of four islands: Puerto Rico, Cuba, Hispaniola, and Jamaica. Moreover, the Puerto Rican twig species closely resembles the twig species of Cuba, Hispaniola, and Jamaica in morphology

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jay871750293

求问33为什么选D呀？？？

又翻到自己的回复，呵呵，现在终于明白了~~

nimabide

文章没有说这个蜥蜴到了另一个岛上就不进化了，完全有可能他原来在自己的岛上进化了，然后自己到了另一个岛上又分别进化了啊。你的逻辑是题目说的现象符合一个理论那么就按照那种理论设想，但是完全有可能符合2个理论啊。

JestinBlue

把这个题坑出来了。。35题A对我能理解，可是为什么E错了呢？ EThey are genetically closely related to one another. 这个不正是最后做DNA实验得出结论的依据么