作者：英吉
Two centuries ago, Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers. This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland. Tufe Island is significantly drier than Tufe Peninsula was. So the current average height of Tufe’s Turfil 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?
A.There are no types of vegetation on Tufe Island that are known to benefit from dry conditions.
B.There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.
C.The mainland’s environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago.
D.The soil on Tufe Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment.
E.The 40-centimeter height difference between the Turfil sunflowers on Tufe Island and those on the mainland is the only difference between the two populations.
题目分析：原文反复谈的就是环境变化对植物高度之间的关系，我们来看看选项，A说没有生物从干燥的环境中收益，原文只是说猜测干燥的环境会导致植物高度有变化，这种变化是好事还是坏事？都不是，是中立，而这个选项中的benefit是不是原文所说的高度变化？不知道，明显是用自己标准衡量原文已知信息的主观答案，干掉。B说这种植物数量多少的问题，没说过，干掉。C说环境改变和高度之间的关系，留着。D说土壤对于高度变化的影响，原文谈的是环境对高度的影响，不是土壤，范围不对，杀。E说高度是植物的唯一差异，没说，干掉。
