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  3. An overwhelming richness of vegetation may have caused the level of oxygen to ri

An overwhelming richness of vegetation may have caused the level of oxygen to ri

游客2023-12-27  38
问题 An overwhelming richness of vegetation may have caused the level of oxygen to rise above today’s______, with a corresponding depletion of carbon dioxide.
选项 A、concentration
B、saturation
C、satiation
D、plenitude
答案 A
解析 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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