Overall, what feature of the Ascension rainforest does the writer stress?

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问题 Overall, what feature of the Ascension rainforest does the writer stress?

选项 A、the conflict of natural and artificial systems
B、the unusual nature of its ecological structure
C、the harm done by interfering with nature
D、the speed and success of its development

答案D

解析 All topics are mentioned, but D is the main idea.
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