TOEFL Listening: TPO-TOEFL阅读TPO - T975612J2R9E94TZN$

According to paragraph 5, which of the following is true about Tilman and Downing's findings? A. General patterns of diversity and stability have been established as a result of the findings. B. Questions about the findings have been refuted by computer models. C. The findings have been tested in a broad spectrum of ecosystems with similar results. D. The findings are not sufficient to prove a definite link between diversity and stability in ecosystems.