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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.
相关因果。
P：岛上的太阳花比半岛上的要矮。岛上的天气更干燥
C：干燥的天气导致了岛上的太阳花矮。
选项要么同时提及“drier“和”shorter“，要么就给出太阳花矮的另外一个原因。
C选项正好排除了一个他因，完成假设。
至于D，提出了土壤含有的物质的另外一个他因，是削弱了选项，不能当作一个假设呀；
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