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Air is composed of ___________ gases inc...

Air is composed of ___________ gases including hydrogen, oxygen, and carbon dioxide.

A. varied    B. variant

C. variable    D. various

 

D 【解析】考查形容词。句意:空气是由氢、氧、二氧化碳等各种各样的气体组成的。various 各种各样的,强调各种不同的,并且常放在名词前作定语;varied 不同的;variable 可变的,易变的(天气等情况);variant(n)变体,变化形式:This game is a variant of netball.这种运动是无挡板篮球的一种变化形式。故选D。  
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