What is mainly discussed in the passage? Why are small green plants very important to dry places? They help keep ______ and pre

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问题 What is mainly discussed in the passage?
Why are small green plants very important to dry places?
They help keep ______ and prevent

选项

答案water in the earth和the wind from blowing the dirt away

解析从第3段第5、6句话可知答案。

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大学英语三级B级

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