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  3. What is the most important service of trees to man according to the passage? The origin of floods and starvation in some countr

What is the most important service of trees to man according to the passage? The origin of floods and starvation in some countr

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问题 What is the most important service of trees to man according to the passage?
The origin of floods and starvation in some countries is ______.
选项 A、too much rain washed away the soil
B、forests took up too much land
C、roots of the trees break up the soil
D、there are no longer trees to keep the rain and protect the top-soil
答案D
解析 答案在文章第二段。饥荒的根源是没有树来锁住雨水和保护表层土壤。
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