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题库 / Prep2012-CR-43
Two centuries ago, Tufe Peninsula became separated from the mainland, isolating on the newly formed Tufe Island a population of sunflowers.
This population's descendants grow to be, on average, 40 centimeters shorter than sunflowers found on the mainland. Tufe Island is significantly drier than Tufe Peninsula was. So the current average height of 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 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 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 sunflowers survive and grow tall in a dry environment.
The 40-centimeter height difference between the sunflowers on Tufe Island and those on the mainland is the only difference between the two populations.
Tufe半岛上的向日葵比mainland上的向日葵矮40厘米，又因为岛上土壤干燥。-> 环境造成了植物的高度差。问assume
choice c, mainland的环境没有变化导致向日葵比两个世纪之前高40厘米。correct，取非以后削弱结论
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