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  3. What is the most important service of trees to man according to the passage? What has been left when top-soil was washed away?

What is the most important service of trees to man according to the passage? What has been left when top-soil was washed away?

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问题 What is the most important service of trees to man according to the passage?
What has been left when top-soil was washed away?
选项 A、Worthless desert.
B、Stone.
C、Flood.
D、Drought.
答案A
解析 细节题。答案在文章最后一段最后一句。表层土壤被冲走后，剩卜的只是没有价值的荒土。
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