Which one of the following best expresses the main idea of the passage？A．The reduction in
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Which one of the following best expresses the main idea of the passage？
A．The reduction in biodiversity represents a setback both for science and for society as a whole.
B．The material and cultural wealth of a nation are insignificant when compared with the country"s biological wealth.
C．The human species is in the process of initiating an unprecedented massive extinction episode.
D．The current decline in species diversity has potentially grave consequences for the human species.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
第一段的第三、四句是本文的主旨句，即这种生物种类减少的最终后果是难以计算的，但是它们确实是有害的。就其本质而言，这就是一场生物多样性的危机。接着又谈到了物种发展的历史和人类对于物种多样性的破坏，最后谈到物种减少的结果难以预测。由此可知答案为[D]，而其他三个选项文中并未提到。