TPO阅读一道细节题，有点苦恼。有没有人能解释一下？

树懒nuo · 发表于 2011-9-18 14:26:58

Timberline vegetation on mountains那篇
Paragraph 3: At the upper timberline the trees begin to become twisted and deformed. This is particularly true for trees in the middle and upper latitudes, which tend to attain greater heights on ridges, whereas in the tropics the trees reach their greater heights in the valleys. This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover. As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges, even though they are more exposed to high-velocity winds and poor, thin soils there. In the tropics, the valleys appear to be more favorable because they are less prone to dry out, they have less frost, and they have deeper soils.

8. According to paragraph 3, which of the following is true of trees in the middle and upper latitudes?
○Tree growth is negatively affected by the snow cover in valleys.
○Tree growth is greater in valleys than on ridges.
○Tree growth on ridges is not affected by high-velocity winds.
○Tree growth lasts longer in those latitudes than it does in the tropics.
这答案是A。为什么呢？求牛牛指教

tobyzrl · 发表于 2011-9-19 19:43:53

根据问题 middle and upperlatitudes 可以定位第二句和第三句中第二句说：因为中高纬度地区， which tend to attain greater heights on ridges ，说的是在山脊上长的更高，后面说的是热带地区在山谷长的高。第三句说：因为中高纬度的，timberlines ，受积雪覆盖时间和深度影响很大。As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges说的是：由于山谷中积雪覆盖的厚且时间长，所以树木往往在山脊长的更高，即使是在more exposed to high-velocity winds and poor, thin soils there 的情况里，再后面就是干扰了 In the tropics：说在热带地区山谷有利于成长，因为@#%￥#￥￥# 所以 B排除 C 其实是受影响的 high-velocity winds ~~~也是第三句 D的话应该在这段没有提到 A的话对~~树木生长受山谷积雪的负面影响.

希望能帮到你~~~加油！

TPO阅读一道细节题，有点苦恼。有没有人能解释一下？

所属分类: TOEFL / IELTS

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