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bunengwangmima · 发表于 2011-4-30 13:49:33

GWD3-Q40
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.
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.(如果去掉Not，则说明并不是Tufe’s的环境问题导致植物矮（植物的高度其实没变），而是mainland的环境变化导致那儿的植物更高了——否定结论：T的环境改变导致了植物变矮)

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.

请问C选项是不是这样理解啊？？？？求教～～

anniecomet · 发表于 2011-4-30 16:10:22

u got it

bunengwangmima · 发表于 2011-5-1 21:46:09

\(^o^)/~thanks

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