People can live without food or water for______. The main idea of this passage is that______.

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问题 People can live without food or water for______.
The main idea of this passage is that______.

选项 A、air is much more important to us than food and water
B、air is around us and we can’t live without it
C、air is as important to us as food and water

答案B

解析 通读全文可知这篇文章讲的主要是空气包围着我们和空气的重要性,这就是如果没有空气我们是不能生存的,而不是主要将空气和食物、水做比较。所以应选B。
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