TOEFL Listening: TPO-TOEFL阅读TPO - 401ITM0E1UBB4384N$

According to paragraph 3, which of the following is true of trees in the middle and upper latitudes? A. Tree growth is negatively affected by the snow cover in valleys B. Tree growth is greater in valleys than on ridges. C. Tree growth on ridges is not affected by high-velocity winds. D. Tree growth lasts longer in those latitudes than it does in the tropics.