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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.
P1:island上的花比原来mainland上的花矮40cm
P2:island上的气候比mainland干燥一些
结论：island上和mainland上的太阳花的差距肯定起码有一小部分的原因是因为island的岛的环境的变化
gap：40cm被认为是island上的花低于mainland的上的花（默认mainland上的花没有变化）==》可是万一如果是mainland变了，而island反倒没有变呢？？
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