这个题用helr方法怎么解释呢

zxclx3

GWD3-Q40:

Two centuries ago, Tufe Peninsula became separated form themainland, isolating on the newly formed Tufe Island a population of Turfilsunflowers.  This population’sdescendants grow to be, on average, 40 centimeters shorter than Turfilsunflowers found on the mainland.  TufeIsland is significantly drier than Tufe Peninsula was.  So the current average height of Tufe’s Turfilsunflowers is undoubtedly at least partially attributable to changes in Tufe’senvironmental conditions.

Which of the following is an assumption on which theargument depends?

A.   Thereare no types of vegetation on Tufe Island that are known to benefit from dryconditions.

B.    Therewere about as many Turfil sunflowers on Tufe Peninsula two centuries ago asthere are on Tufe Island today.

C.   Themainland’s environment has not changed in ways that have resulted in Turfilsunflowers on the mainland growing to be 40 centimeters taller than they didtwo centuries ago.

D.   Thesoil on Tufe Island, unlike that on the mainland, lacks important nutrientsthat help Turfil sunflowers survive and grow tall in a dry environment.

E.    The40-centimeter height difference between the Turfil sunflowers on Tufe Islandand those on the mainland is the only difference between the two populations.

答案是C

小蘑菇开始打怪

来试一下，我认为这道题的推理模式是相关因果，CQ那三个就不说了

干燥导致高度低

答案要么同时涉及两方面，要么就说明一个新的因素解释高度的问题

然后C选项就是同时涉及两方面，说明干燥和高低确实是有关系的，那样就可以得出原文中的结论了。

Helr

小蘑菇开始打怪 发表于 2014-4-1 19:29
来试一下，我认为这道题的推理模式是相关因果，CQ那三个就不说了

干燥导致高度低

前面判断类型什么的都灰常nice~~~就是最后一点儿我有点不同意见，咱们讨论讨论。
(C)选项的意思简单来说是：“不是mainland上的气候导致它上面的植物长高了40cm”。原文中的结论是，“是岛上的气候导致植物身高差距”。所以说，实际上，这个选项是否定了一个可能的“独立第三因素”，即，是mainland上的气候导致的植物身高差距。因此，其可以加强整个推理。

小蘑菇开始打怪

Helr 发表于 2014-4-1 21:11
前面判断类型什么的都灰常nice~~~就是最后一点儿我有点不同意见，咱们讨论讨论。
(C)选项的意思简单来说 ...

懂了~这个气候变化要分清楚是岛上还是mainland的。

排除了mainland的影响那就更加强了岛的影响。谢谢Helr~

zxclx3

Helr 发表于 2014-4-1 21:11
前面判断类型什么的都灰常nice~~~就是最后一点儿我有点不同意见，咱们讨论讨论。
(C)选项的意思简单来说 ...

灰常感谢哈哈