What is the most important service of trees to man according to the passage? [br

游客2023-10-03 68

问题 What is the most important service of trees to man according to the passage? [br] 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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