2. 外语
  3. What is mainly discussed in the passage? How more and more ____________________________. Why are small green plants very impo

What is mainly discussed in the passage? How more and more ____________________________. Why are small green plants very impo

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问题 What is mainly discussed in the passage?
How more and more ____________________________.

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 从第三段第五、六句话可知答案。
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