The assumption that the tropical ecosystem of Amazonia has been created solely by natural forces

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问题 The assumption that the tropical ecosystem of Amazonia has been created solely by natural forces

选项 A、has often been questioned by ecologists in the past.
B、has been shown to be incorrect by recent research.
C、was made by Peter Feinsinger and other ecologists.
D、has led to some fruitful discoveries.

答案B // has been shown to be incorrect by recent research

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