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

　　② 非谓语动词作状语

　　例题10：

　　Paragraph 6: Under very cold conditions, rocks can be shattered by ice and frost. Glaciers may form in permanently cold areas, and these slowly moving masses of ice cut out valleys, carrying with them huge quantities of eroded rock debris. In dry areas the wind is the principal agent of erosion. It carries fine particles of sand, which bombard exposed rock surfaces, thereby wearing them into yet more sand. Even living things contribute to the formation of landscapes. Tree roots force their way into cracks in rocks and, in so doing, speed their splitting. In contrast, the roots of grasses and other small plants may help to hold loose soil fragments together, thereby helping to prevent erosion by the wind.

　　The word them in the passage refers to

　　Cold areas

　　Masses of ice

　　Valleys

　　Rock debris

　　托福阅读指代题练习题答案：2

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