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(创新题) Normally, which of the following t...

(创新题) Normally, which of the following takes up almost 21% in the air________

A.CO2. B.O2. C.H2O. D.CO.

 

B 【解析】 句意:通常,空气中大约占21%的成分是哪个?由化学知识可知,空气中氧气大约占21%。故选B。  
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