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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.
重新分析：
①两个世纪以前半岛从大陆分离出来了。（同时从大陆分出了一些太阳花）
！注意时态的变化！
②这些太阳花的后代现在长得比大陆的太阳花矮40cm。
③ Tufe Island is significantly drier than Tufe Peninsula was. 半岛现在比以前要更干燥。
结论：半岛的太阳花比大陆的太阳花矮有一部分原因赖在半岛的环境变化。
gap：有没有可能两个地方的太阳花之间的差异是因为大陆的太阳花变了。
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