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miraere

Timberline Vegetation on mountains - 黄金29篇上一个题目

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 upperlatitudes?

○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.

答案给的A，不明白为什么是NEGATIVELY，文章里“As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges,，开始以为不应该是NEGATIVELY，后来想了想才发现，这题目太玄了。POSITIVE应该是雪厚了树应该矮。。。

jiangl04

有些题目值得细细体味