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Two centuries ago, Tufe Peninsula became separated from 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.
Descendant=后裔，子孙
Which of the following is an assumption on which the argument depends? 新T的花比旧T的矮,新T比旧T干燥.所以新T的花矮是因为T的环境改变了(即新T从旧T分离后环境改变影响花)
A. There are no types of vegetation on Tufe Island that are known to benefit from dry conditions. 无关 题目关注的是环境改变对花的影响,而不仅仅是某种环境影响花
B. There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today. 无关 和环境改变无关,没有对比不同时间的不同地方.
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. 旧T的环境没有变,使得旧T的花比以前高了很多. 削弱后:旧T的环境改变了但旧T的花还是高,(即环境不影响花,否定了结论)
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. 他因削弱 同A,未说环境改变,只说了T不利于花生长.
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. 无关 高矮的区别是唯一区别,明显无关~
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答案是C，但我看了旧帖讨论，貌似思路不一样。但我也看不出哪儿有问题，大家检查下吧 |
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发表于 2010-8-18 11:39:21
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