What does the forest strike mankind as permanent? Why is a "secondary succession" quicker?

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问题 What does the forest strike mankind as permanent?
Why is a "secondary succession" quicker?

选项 A、The ground is more suitable.
B、There is more space for new plants.
C、Birds and animals bring new seeds.
D、It is supported by the forest.

答案A

解析从第四段的中间，我们可以看出，根本的原因乃是土壤较为适宜。

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