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标题: gwd 3-40 麻烦给看看，谢谢！ [打印本页]

作者: yanginottawa 时间: 2005-11-7 12:40
标题: gwd 3-40 麻烦给看看，谢谢！

Q40:

Two centuries ago, laceName w:st="on">TufelaceName> laceType w:st="on">PeninsulalaceType> became separated form the mainland, isolating on the newly formed laceName w:st="on">TufelaceName> laceType w:st="on">IslandlaceType> a population of Turfil sunflowers. This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland. laceName w:st="on">TufelaceName> 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?

There are no types of vegetation on Tufe Island that are known to benefit from dry conditions.

There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.

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.

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.

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.

答案C，我选了D，不理解为什么，C与D的对错到底在哪里？

C说大陆的环境没有变得可以让此植物长高，这究竟跟半岛上的环境有什么关系？求高人指点，感激！！

作者: yanginottawa 时间: 2005-11-9 00:02

thanks a lot

作者: 芷菁 时间: 2005-11-9 02:42

文章中问你结论依赖的假设是什么？文中说岛上的比大陆的矮，是因为岛上的环境干燥使分离过来的这种植物长不高。因为岛的分离是二个世纪之前发生的，也就是假设这么长的时间内陆地上的植物没有因为环境的因素变高了。如果否定这个假设，结论就不成立。

D是他因。文中已经说了是环境干燥引起的，和土地的营养成份无关。

作者: yanginottawa 时间: 2005-11-9 08:23

明白了，谢谢！

我一直在想“So the current average height of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions”跟选项的联系，而忘了降低40厘米的事了，如果大陆上的没张高，那当然是岛上的矮了。有点钻牛角尖了

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