People can live without food or water for______. When we are sleeping we______.

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问题 People can live without food or water for______.
When we are sleeping we______.

选项 A、need less air
B、need more air
C、don’t need air at all

答案A

解析 根据第二段最后一句When we are asleep,we need less air.可知睡觉的时候。我们需要的空气就较少。所以应选A。
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