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.
为什么选择C?作者: je04tta 时间: 2013-6-4 20:42
用not＋weaken来做
题中结论：现在Ｔ的ＴＳ的平均高度一定有部分原因在于Ｔ的环境变化．（Ｔ是
从mainland分出去的）
Ｃ去掉not后，意思为 mainland的环境变化了导致mainland的ＴＳ比以前高了４
０厘米．
削弱了原文的结论，说Ｔ和mainlande的ＴＳ高度是由mainland的环境变化导致的
而不是Ｔ的环境变化．作者: wowuliao 时间: 2013-6-5 05:51
谢谢啊!了解了!作者: lohashilda 时间: 2013-6-5 20:45
为什么我觉得那个 form 的单词放在那边那么的奇怪呢？感觉那句话读不通啊。是不是应该改成from 呢？
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