An overwhelming richness of vegetation may have caused the level of ox-考呗网

2级

单选题An overwhelming richness of vegetation may have caused the level of oxygen to rise above today's__________, with a corresponding depletion of carbon dioxide.

参考答案：A进入在线模考

[分析]名词辨析
A．concentration集中，浓缩，浓度；B．saturation饱和，饱和度；C．satiation饱食，饱满，厌腻；D．plenitude充分；因此A为答案。

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