阅读绿皮书上一题 求解释！！！

olalaleeUID: 3390521

Experiments show that insects can function as pollinators of cycads, rare, palm-like tropical plants. Furthermore, cycads removed from their native habitats –and therefore from insects native to those habitats-are usually infertile. Nevertheless, anecdotal reports of wind pollination in cycads cannot be ignored. The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds if which are released from some of the larger cones. The male come of Cycas  circinalis, for example, sheds almost 100 cubic centimeters of pollen ,most of which is probably dispersed by wind . Still, many male cycad cones are comparatively small and thus produce far less pollen. Further-more, the structure of most female cycad cones seems inconsistent with direct pollination by wind. Only in the Cycas genus are the females’ ovules surrounded by a loose aggregation of megasporophylls rather than by a tight cone.


Question:
The evidence in favor of insect pollination of cycads presented in lines 2-3 would be more convincing if which of the following were also true?
A: only a small variety of cycad species can be successfully transplanted.
B: cycads can sometimes be pollinated by means of other than wind or insects.
C: insects indigenous to region to which cycads are transplanted sometimes feed on cycads
D: winds in the areas to which cycads are usually transplanted are similar to winds in cycads’ native habitats
E: The transplantation of cycads from one region to another usually involves the accidental removal and introduction of insects as well.
   
答案是D

olalaleeUID: 3390521

自己顶

olalaleeUID: 3390521

再顶！

olalaleeUID: 3390521

求人解释啊~~

forverUID: 3400270

发帖实在是麻烦。
这篇文章说实话我也有好多单词不认识，但是能做出来题。
文章总共讲了两种授粉方式，虫媒和风媒。
Furthermore, cycads removed from their native habitats –and therefore from insects native to those habitats-are usually infertile（不育的）.从这句话里来看，虫媒往往是失败的。

然后就开始大讲风怎么怎么，可以看出这才是风媒至少是比虫媒好，他是一种相对而言更加自然地方法。
The structure of cycads male cones is quite consistent with the wind dispersal of pollen。然后举例说明。最后又来了句Further-more, the structure of most female cycad cones seems inconsistent with direct pollination by wind.可见用风也是有问题的。

题目实际上就是要加强cycads removed from their native habitats。主要就是突出昆虫的的自然的方式和和这个什么植物的自然方式不合适才导致的受粉失败，那么文中就说了两种方法，昆虫不行，但是植物还是要繁殖的，那么只能选另一种了，就是下文说的风，也就是说，答案就应该是弥补了风媒传播的缺陷或者突出风媒传播更好，所以我选D。别的答案感觉都没什么关系。当然，还有种答案应该是夸大虫媒的缺陷，可惜答案中也没找到。

olalaleeUID: 3390521

forver 发表于 2012-11-29 14:05
发帖实在是麻烦。
这篇文章说实话我也有好多单词不认识，但是能做出来题。
文章总共讲了两种授粉方式，虫 ...

可是D项说两个地方的wind相似就加强风媒么？

NightzzUID: 3320648

ls说的有点儿复杂了。很简单的小逻辑题，排除他因即可。两种方式，想说明其中一种的特点，必然要把另一种的影响消除（对照试验的思想）。所以只有排除掉风的影响，才能说，这种变化是由于虫导致的。

forverUID: 3400270

关键词就是 cycads’ native habitats 。
昆虫和风本来就是两种传播方式，一种方式的优越性也就证明了另一种方式的无力。
所以答案不是证明昆虫这种方法更加无力就是证明风这种方式更加好。

olalaleeUID: 3390521

Nightzz 发表于 2012-11-29 21:45
ls说的有点儿复杂了。很简单的小逻辑题，排除他因即可。两种方式，想说明其中一种的特点，必然要把另一种的 ...

感觉night 正解~！

NightzzUID: 3320648

forver 发表于 2012-11-29 22:06
关键词就是 cycads’ native habitats 。
昆虫和风本来就是两种传播方式，一种方式的优越性也就证明了另一 ...

亲。。。我不想打击你，但是你的这个reasoning真的是totally wrong啊。“一种方式的优越性也就证明了另一种方式的无力”，这句话不是很典型的specious statement吗？文中有说这种此消彼长的关系吗？想当然是GRE大忌，千万别这么想问题

NightzzUID: 3320648

olalalee 发表于 2012-11-29 22:22
感觉night 正解~！

没有感觉的亲，对不对自己心里要有数，坚持对错分明，你会从中受益的。每道题都要这样，为什么对一定要清楚，不能模棱两可。

forverUID: 3400270

受到你们的启发，我的思路更加清晰了。
第一次讨论题哈，感觉蛮有收获的。
文中讲的是这种植物被移植到一个新地方，然后两种因素抑制他的繁殖。
一种是虫，一种是风。
要证明虫对它影响更大，那么从逻辑上讲要不就是证明昆虫本身的影响更大，要不就是证明风对它的影响更小。
即使选了D也不能证明风对它就没有影响了，所以我认为还是两者之间存在比较。