people can't live without water or air为什么是or

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people can't live without water or air为什么是or

people can't live without water or air为什么是or
people can't live without water or air为什么是or

people can't live without water or air为什么是or
因为这是否定句(没有水和空气,人类不能生存.)
肯定句里用and