不定项选择题：我们生存的空间充满了无色、无味、透明的气体，它既看不见，也摸不着，所以人们称它为“气体”。下列关于空气的说法，错误的是（

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题目内容：
我们生存的空间充满了无色、无味、透明的气体，它既看不见，也摸不着，所以人们称它为
“气体”。下列关于空气的说法，错误的是（　　）。 A．空气中氮气和氧气所占的比例最大，分别为78．09%和20．95%
B．氧气是大气中最活跃的成分，它能使岩石风化、有机物腐烂
C．若没有臭氧层的保护，地球上的很多动植物都会因紫外线辐射过强而死
D．若没有大气的保护，地球表面的平均气温为-23℃，有了大气，则现在地球表面的温度为26℃
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