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题库 / Prep2007E2-CR-1
On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement. The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them.
Which of the following contributes most to an explanation of the difference between gecko populations in urban and rural areas?
In urban areas, geckos are valued because they eat so many insects.
Geckos defend territories against other members of the same species.
House geckos that arrive on islands are carried there in boats and planes.
In places where there are lighted buildings, insects tend to gather around the light.
Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually.
background information :在城市house gecko取代mourning gecko , 但是两种gecko的数量在农村相对稳定。
house gecko不会攻击mourning gecko, 但是在昆虫聚集的地方house gecko会阻止mourning gecko捕捉虫子们
解释urban, rural地区gecko 数量差距的原因
choice d, 在有灯光的楼，虫子们会聚集在一起。-> 在urban和insects之间架起了链接
but in areas where insects congregate IT prevents the mourning gecko from feeding on THEM
it指代house gecko，them指代insects
类比
在农村，HG和MG两种鸟的数目要比在城市更稳定
HG不袭击MG，但在昆虫聚集的地方它会抢MG的食物，不让MG吃
解释（城市/农村稳定）
A、在城市，G因为吃很多昆虫，所以很珍贵；无关，没提HG/MG，没提城市or农村的差异
B、面对同物种的其他成员，G保护自己的领地；无关，没提HG/MG，没提城市or农村的差异
C、HG坐着船和飞机来的；无关，没提城市or农村的差异
D、在有发光建筑物的地方，昆虫聚集（虽然但是，暗示了城市是发光建筑物更多的地方，也就是昆虫比较聚集，不像农村那样发散，在捕食时，HG会抢食，也就解释了为什么城市两者的数目不太稳定（因为存在竞争关系）），CORRECT
E、MG无性繁殖，HG有性繁殖；无关，没提城市or农村的差异
On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement. The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them.
HG不攻击MG，但是HG会组织MG吃insects——HG取代MG，HG和MG的数量在没人的地方更稳定；
搞清楚要解释的现象是什么：urban和rural地区HG和MG数量区别的原因
The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them.
主要說Ｈ部會攻擊Ｍ，但在蟲多的地方，Ｈ會讓Ｍ吃不到蟲 -->言下之意就是蟲多的地方，Ｈ比Ｍ多．
ＯＡ：Ｄ提到，都市＝ lighted buildings，蟲會聚集在一起 （言下之意就是蟲會很多的地方）
找解释，就是找城市和乡村的区别这一点
D 区别指出，并且insects与文段联系起来
笔记：好像只能用排除法了
(A) NTArg：the argument ask us to explain the discrepancy between Geckos population in rural and urban areas.
(B) NTArg: still, the information cannot prove the differences b/t Geckos ppl in rural and urban areas.
(C) IRR: irrlevant information.
(E) IRR: no matter whether the way geckos reproduce can influence the ppl or not, the information cannot explain the difference of geckos ppl in r and ur area. (btw, the stems do not offer any information about reproduction.)
看清题目：问的是如何解释population在城市和乡村的差异，而不是说壁虎的差异
果因 CQ2-因果联系
果：B geckos' population declines in urban
因：B is vulnerable under situation A
OA: situation A happens in urban. 【因此，为因果联系】
(A) NTArg：the argument ask us to explain the discrepancy between Geckos population in rural and urban areas.
(B) NTArg: still, the information cannot prove the differences b/t Geckos ppl in rural and urban areas.
(C) IRR: irrlevant information.
(E) IRR: no matter whether the way geckos reproduce can influence the ppl or not, the information cannot explain the difference of geckos ppl in r and ur area. (btw, the stems do not offer any information about reproduction.)
在城市里面H壁虎较多，而在农村，H壁虎和M壁虎差不多。这两种壁虎一般情况下相安无事，但是在昆虫较多的地方，H壁虎就占尽优势。