阅读理解。
Air is all around us. It is around us when we walk and play. From the
moment we are born, air surrounds (包围) us. When we sit down, it is around
us. When we go to bed, air is also around us. No matter where we are on the
earth, air surrounds us. We live in air.
All living things need air.  Living things cannot live without air.  We can go
without food or water for a few days, but we cannot live for more than a few
minutes without air. When we are asleep, we need less air.
1. Air is _____ around us.
A. always
B. often
C. sometimes
D. never
2. People can live without food or water for _____.
A. many years
B. a few years
C. a few months
D. a few days
3. _____ can live for more than a few minutes without air.
A. Everybody
B. Not everybody
C. Somebody
D. Nobody
4. When we are sleeping we _____.
A. need much air
B. don't need so much air
C. need more and more air
D. need no air at all
5. The main idea of the article is that _____.
A. air is as important to us as food and water
B. air is much more important to us than food and water
C. air is around us and we can't live without it
D. air is far away from us and we can't get it

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