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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.
2个世纪前，T半岛从大陆分离，形成T岛，上面有一些太阳花。这些太阳花的后代比大陆的太阳花矮40厘米。T岛比原来的半岛干燥的多。 所以这些太阳花的高度至少部分由于T岛环境变化，问假设，加强，取非看削弱; 相关因果推理；
A. T岛没有植物受益于干燥环境；无关
B. 2世纪前的T半岛和现在的T岛太阳花一样多；两个世纪以前岛都没分开，无关
C. 大陆环境没有变化，使得太阳花比2个世纪前高了40厘米；取反即大陆环境变化使太阳花高了40厘米，削弱了T岛干燥环境使太阳花矮了40厘米，即取非变加强了，正确
D. T岛土壤缺乏重要的营养素，那些营养素能让太阳花在干燥环境下长高；独立第三因素，削弱了干燥环境影响，我们要找加强
E. 40厘米高度差是T岛和大陆太阳花的唯一区别；无关
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