-Forests are very important, aren’t they?-Yes. They can prevent the water washing the earth away.A．forB．toC．from 题目和参考答案——青夏教育精英家教网—

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—Forests are very important, aren’t they?

—Yes. They can prevent the water washing the earth away.

A．forB．toC．from

【解析】

试题分析：句意:森林是重要的，对吗？-是的，他们可以防止水把土壤冲走。prevent sth. from doing sth. 阻止某人做某事。这是一个固定的句型，介词应该用from。for 为了，因为；to 到。

考点：考查介词。

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