[請益] TPO TIMBERLINE VEGETATION ON MOUNTAINS 試題一問
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.
為什麼選項三不行? 答案是一
謝謝
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