标题: GWD3-Q40 [打印本页]
作者: mudiduanger 时间: 2010-10-11 06:57 标题: GWD3-Q40
本帖最后由 mudiduanger 于 2010-10-11 06:58 编辑
Two centuries ago, Tufe
Peninsula became separated form the mainland, isolating on the newly formed Tufe
Island a population of Turfil sunflowers.
This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland.
Tufe
Island is significantly drier than Tufe
Peninsula was.
So the current average height of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions.
Which of the following is an assumption on which the argument depends?
A There are no types of vegetation on Tufe
Island that are known to benefit from dry conditions.
B There were about as many Turfil sunflowers on Tufe
Peninsula two centuries ago as there are on Tufe
Island today.
C The mainland’s environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago.
D The soil on Tufe
Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment.
E The 40-centimeter height difference between the Turfil sunflowers on Tufe
Island and those on the mainland is the only difference between the two populations. （C）不是太理解，请达人指点！
作者: xiaotangyu 时间: 2010-10-11 20:51
LZ能不能把你不理解的选项讲的更具体一些？
C取非削弱，典型的假设题。如果大陆的环境变化，使大陆上的花发生了变化的话，那么就不能说是海岛上的气候导致迁移到海岛的花朵发生了矮化的变化。起到了削弱的作用，所以选项就是它了。
作者: 小月潇湘 时间: 2010-10-12 20:28
假设是因为大陆的气候没有变,就排除了大陆气候变导致两者不同的情况了.就说明是岛上的气候导致两种植物的差别了.
我认为这算是一种排除他因吧
说得有点乱,不知道lz看不看得明白
作者: wydhcuy 时间: 2010-10-13 06:42
environmental condition和mailand environment的区别是什么呢
我怎么感觉c是与原文相反的呢
作者: parispings 时间: 2010-10-14 06:49
变成岛之后发现比之前的矮40
结论说这现象与后形成的岛的气候有关。
C说不是后形成的岛的气候的关系，是原来的岛的气候使得原来陆地上的花长高了40
这样这个difference就和后形成的岛没有关系，是原来的地方的问题。
作者: echo19872010 时间: 2010-10-20 06:37
应该这样理解更加清楚：
原文说是由于环境的变化导致岛上的花比大陆的花矮40cm，C选项说大陆的环境没有变化，但是花却长高了40CM，那就说明如果岛上的气候不变化的话，花也应该长高40CM，但是现在是岛上的花比大陆的矮了，那就说明岛上的气候发生了变化的。
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