托福阅读指代题实质是考察单词间指代关系的能力。小编为大家带来托福阅读指代题范例，希望对大家托福备考有所帮助。

　　托福阅读指代题例题

　　3. 句内指代

　　1)逻辑指代：

　　例题6：

　　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.

　　The word they in the passage refers to

　　valleys

　　trees

　　heights

　　ridges

　　托福阅读指代题练习题答案：1

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