请教TTGWD11&新prep1上面一道阅读题。

ymcheswin

Anole lizard species that occur together (sympatrically) on certain Caribbean islands occupy different habitats: some live only in the grass, some only on tree trunks, and some only on twigs. 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. What is striking about these lizards is not that coexisting species differ in morphology and habitat use (such differences are common among closely related sympatric species), but that the 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, habitat use, and behavior. Likewise, the specialists for other habitats are similar across the islands. The presence of similar species on different islands could be variously explained. An ancestral species might have adapted to exploit a particular ecological niche on one island and then traveled over water to colonize other islands. Or this ancestral species might have evolved at a time when the islands were connected, which some of these islands may once have been. 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, each specialist could have arisen independently on each of the islands.

If each type of specialist evolved just once, then similar specialists on different islands would be closely related. Conversely, if the specialists evolved independently on each island, then a specialist on one island would be more closely related to other types of anoles on the same island—regardless of their ecological niches— than it would be to a similar specialist on a different island. Biologists can infer how species are related evolutionarily by comparing DNA sequences for the same genes in different species. Species with similar DNA sequences for these genes are generally more closely related to each other than to species with less-similar DNA sequences. DNA evidence concerning the anoles led researchers to conclude that habitat specialists on one island are not closely related to the same habitat specialists elsewhere, indicating that specialists evolved independently on each island.

According to the passage, sympatric anole lizard species resemeble many other closely related sympatric species in that the anole lizard species:

A differ from one another in morphology and habitat use

B evolved on islands that were once connected

C appear to have adapted unusually quickly to new habitats

D have been able to colonizae areas remote from their ancestral habitat

E occupy the same range of habitats in a number of different locations.


能找到这篇阅读，但是到处都找不到这个题目，只能自己打下来了。答案选A，哪位大牛能帮忙解释一下怎么能选出A来？？

先谢过了

ymcheswin

自己顶一下，请求牛人指导啊！！！

Gry

同求啊，有没有高人的。。。

ymcheswin

我去的，还有一天考试。再顶一次。拜托大家了啊

妞妞扭扭

What is striking about these (sympatrically)  lizards is not that coexisting species differ in morphology and habitat use (such differences are common among closely related sympatric species.
可能是这句。

沙龙

看PREP的时候也遇到这道题，研究良久，发现这题比较坑爹，有个is not很容易误导。
原文高亮的 What is striking about these lizards is not that coexisting species differ in morphology and habitat use (such differences are common among closely related sympatric species)
实际上说，变色龙也是differ in morphology and habitat use，不过这个特点不striking，而这些特点其实是closely related sympatric species的。

其实这道题就是考括号

qhfzwyx

同问这个，还是没明白，in that 不是因为么？为什么同地区的Lizard相似是因为它们不同的形态和习惯？？

gingerlj

我的理解是生长在这个岛上的这一批（三种）和其他四个岛上的一批相似的原因，同样理由是高亮句，这一批都在不同的栖息地里生活

chachacha007

同意考括号的说法，这个其实就是在问，这个XXX lizard和XXX species有什么相似之处，原文中括号里就说了，很多species都有这种m和h的不同，注意这里是lizard和其他species的比较，和原文的主流方向不同，
我觉得恐怕难就难在这里，做题的时候思考重心全在岛和岛之间的lizard去了，完全没有注意到说的是other XXX species