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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！！ | 
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发表于 2005-11-7 12:40:00
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