What does the forest strike mankind as permanent? [br] What conditions are neede

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问题 What does the forest strike mankind as permanent? [br] What conditions are needed for shrubs to become established?

选项 A、Ferns must take root.
B、The ground must be covered with grass.
C、More soil must accumulate.
D、Smaller plants must die out.

答案 C

解析在第三段的中间，只有在长过苔藓之后草木和shrub(灌木)才能生长，因为已经固定相当一部分土壤，有利于植物生长，故选C。

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